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I think there's one or two things I can contribute with, that haven't been touched yet. For you girls, I think that the best way to imagine how an erection feels like, clothes or not, is to think of your clitoris. Some of you may not know this, but a clitoris is basically an internal penis. The actual clit would be the equivalent of the male glans (the 'head' of the penis) and it's just the tip of the larger body that extends behind your vaginal wall. If you want to know what an erection feels like, then get aroused and pay close attention to how your clit behaves. You'll notice that at first it's just small, but that as your arousal increases, it begins to swell with blood and become very responsive to pleasure. That's pretty much what we feel, too (and really, it's the exact same erectile tissue, the sensations are practically the same), including the build-up to an orgasm. You can also draw a parallel between a clitoris and an uncut cock. A clit has a 'hood' covering it, called prepuce, which is pretty much the female equivalent of a guy's foreskin (so if you want to know how foreskin feels like, well... you have a way to find out). It protects the clit from abrasion and chafing. This varies from guy to guy and woman to woman, but generally, a woman who's not aroused or only slightly so might actually feel discomfort or pain if (for example) a guy rolls back the prepuce and tongues her clit directly. That happens to uncut guys who aren't fully hard, too. As the levels of arousal increase, the erectile tissue is capable of enduring more direct contact, to the point where it's actually very pleasurable for both to apply direct stimulation. And finally, a penis is not (usually) something that can be turned on and off like a lamp. Going from limp to throbbing hard and back again isn't something that happens in a matter of seconds (save specific exceptions, like exceedingly powerful stimuli). There are stages of hardness, but the time that takes the guy to go from one to another varies depending on the guy in question and what's triggering the arousal. Also, not all guys have the same amount of stages. Some have just four, some have more, some may even have only three or two. The first stage is limpness, which is the cock that hasn't even begun to experience arousal. This is the default state (when an erection is the default state, it's called priapism and it's a very hilarious illness). Then there's the 'stirring' stage, where the male first sees something vaguely arousing. He might catch a glimpse of cleavage or start fantasizing. The cock is not hard here, but it sends 'warning signs' to the guy, telling him that if he keeps going down that road, things are going to get stiff. If the guy is clothed, nothing is visible. If the guy is naked, his cock might twitch on its own or even roll lazily a little, across his leg/navel/hip. Might grow an inch or so if the guy's a grower (that is, if his cock changes size between limp and hard. Some guys have the same size regardless of arousal, they're usually called 'showers'). Then you have the 'half-hard' stage, in which the arousal continues its course and blood begins to flow into the penis. Here is when the guy starts to get slightly stiff and his dick starts to grow. If the stimulus isn't strong enough, the growth might stop here. If a guy catches sight of a nice ass, for example, maybe it won't get him fully hard (depends on his personal tastes), but it might be enough to get his blood flowing. Usually the cock remains like this for a few moments even after the arousing stimulus has passed, it doesn't immediately go back to limp (assuming he doesn't see something horrifying that completely kills his mood, of course). It's like his cock is saying "hey, are you SURE you don't want to keep thinking about that ass? I already have all this blood here, it would be a shame to send it back to the body..." Some guys have different stages of hardness, and whether all or some of them should be called "fully" hard is a matter of debate. What they all have in common is that a guy can orgasm in this state. If a guy is jerking off, for example, to relieve stress or because he's used to it or because his body demands release, he might not become 100% hard. He might only reach 90% of his potential, but it's still enough to climax. It's like a chore, the guy's not really into it. He gets hard enough to do his job, comes, and then he goes back to limp very fast (in a minute or less). Now, if the guy is actually interested and he's very aroused, he might reach his peak and become as hard as he can get. The main difference between these is basically the intensity of the orgasm and the volume of cum. In the first case, the guy may have a quick orgasm and shoot a small load, maybe a couple of shots. In the latter, the guy may have a longer, 'better' orgasm, and his ejaculation might be a little or a lot more copious. Oh, and in the latter case, the cock usually stays hard for a long time after climaxing (from a couple of minutes to remaining hard enough to go at it again once the refractory period is finished). Of course, some guys have more than these stages. Maybe a guy gets 80% hard when he's jerking off every day, but he can get 90% hard when he's getting laid, and 100% hard when his girlfriend/boyfriend has him tied down and spanks him with gusto; or he engages in his favorite fetish. It varies. And as a closing advice: watch porn. No, seriously. The best way to familiarize yourselves with a penis is by looking at it so often and from such different angles that you can practically draw it with your eyes closed. Look at the different shapes they come in, how they change color depending on how hard they are, how most guys will start dribbling precome if they're REALLY aroused and they're not getting any. It doesn't need to be video, of course. Pictures/manga/etc work just fine, too. The key is to get as familiar with it as you can. I think that's all, hope this helps iron out some leftover details on the matter.

lawlz, a man ALWAYS knows when he's "getting hard." a lotta girls may not even have the slightest idea about this, but there's actually a long, long, LONG time where the guy's not hard at all (depending on the situation of course). assuming all things equal (no pressing urgency, etc), a guy sorta starts getting "tingly" let's say. it's a shift in his breathing, in the flow of his blood. usually, he'll do a sorta half-shift, a reposition of sorts, because his dick is getting "twitchy" and he doesn't want it to show through his pants. any man who's finished puberty is EXCELLENT at controlling and concealing his erections. it's sort of a "trial by fire" if you will. after a few years of suffering from rock-hard erections that come and go in a flash, at incredibly inoppertune times, we kinda learn to deal. but more to your original question, the best analogy I've ever been able to come up with is this: all men have a penis. a penis he likes very, very much. easiest explanation? girls, think about your tongue. think about how often you move it around in your mouth, outside of talking or eating. think about how sensitive it is, how often you accidentally burn or bite it. how generally aware of it you are at all times. now put that between your legs. that is a penis. men are ALWAYS generally aware of their penis. it's a protruding object in a very inconvenient place. god, I can even think of the number of times I accidentally sit on my balls and flinch in pain every day. hah, well it's probably not even one or two times a week, but still, those few times I do I remember it (ow!). when I stand up, I feel it drop and shift. if I switch positions, sometimes I have to adjust it because otherwise it will look REALLY FREAKING OBVIOUS where it is. I am aware of it at all times. I am on constant alert for flying/falling object that seek to harm it, because GOD does that hurt. it's like getting knifed in the kidneys, even with just a glancing blow. all men know this, all men fear this (well, maybe not the weird, creepy guys who like to pay hot women to knee them in the balls, but you're probably not writing about those in slash are you? ). anyways, does that kind of give you some background information about the penis itself? the whole tongue-thing should sort of be kept in mind when trying to explain an erection. I don't know how in-depth of an explanation you want though. I mean, it's really kind of two-part system. the guy started feeling aroused first. like I mentioned earlier, it's just... a shift in the blood. his lips part maybe, or his interest increases. it's very subtle. basically though, his body's just being like "hey! hey dude! if we're gonna get hard, I'm ready! just lettin' you know!" his dick's not even hard at all at this point. it probably hasn't even swelled, to the naked eye. it's kind of... poised, though. on the precipice. then, depending on whether there's going to be more sexually stimulating stuff going on, it might get harder, it might soften, depending on how anxious he feels about it. like, if he's kinda into what's going on, it'll slowly inflate as he gets more into it. if he's turned on, but he knows he's not getting any or it's not "stimulating" enough, or if he simply has a great deal of self-control, he'll stay in a semi-hard state for a bit before his body realizes nothing fun is gonna happen and gives up. he may be still *aroused* for a good while, but his erection is not into it. his body has better things to do (and, of course that doesn't preclude him from getting hard later). physically, there's ALWAYS readjustment. depending on the position his penis is in, getting hard could be a fucking *bitch*. if like, the penis is tucked downward, alongside the crease of the hip and leg, getting hard is fine. pleasant, even! the resistence gives a bit of friction with each pulse of blood and the guy's kind of "safe" because his dick's tucked away in an unnoticable spot. if it's along the length of the leg though, fuck! that shit sucks! you either have this obvious tube arcing over one leg, or it starts to get REALLY hard and slides up to nuzzle your waistband! then the guy has to shift position, or readjust somehow to either relieve the tightness of his stomach pushing against his dick pushing against his waistband, or to conceal the obvious boner he has. and then for the actual penis, that really depends on the guy. some dudes have a high pain tolerance, and can jerk off with just their hand. others just require spit, and then some guys (usually uncut) won't let you even think about touching their dick without a handful of lotion or lather. uncut is different too, because it's like a tight ring of skin sliding out over a very sensetive tip. purse your lips tightly and then slide your tongue through them. it's kind of like that, depending on the tightness of the guy's foreskin (ranging from hella tight to really loose). then, depending on how horny the guy is, his dick could be a mere shadow of its real self (if he's not interested, anxious, bored) or it could pack on exxxxtra inches like no tomorrow, surprising even the dude who owns it (if he's SUPER-ULTRA-MEGA turned on!). of course, neither case is necessarily a garauntee of climax. erections can be so hard the dude's willing to drive it through a brick if he has to, and then other times he's going great and suddenly he feels the blood returning to the rest of his body and he's like "no no no stay hard please stay hard!" only now he's super worried and the hot babe looking at him is making him feel emasculated and weak and that's only making it worse and now his erection has turned into a limp droop but short answer is: a man might be surprised by his erection on the rare occasion that something has captured 99% (NINETY NINE PERCENT) of his attention/is so unbelievably erotic that his brain is on overload and he can't hardly think, but generally no. guys know when they're going to get one, whether to stop it from happening, and how to shift, adjust, and sit so that no one around them has a clue.