One thing I appreciate here on AFF is that we don’t have to consider sexuality a gift of the 18th birthday, that it’s part of the human condition from the day we’re born.
Stuff I write is usually underdogs, their development, which tends to include youth, teenagers, and college-aged characters because its these early years that tend to set them up – sure, can happen later too, but way more likely with early indoctrination. Jeff? He’s eight, in the middle of taking a bath, when the father comes to execute a custody order in the middle of a divorce, thus Jeff’s leaving his family home in his birthday suit, and gets relocated to a nudist environment as that’s a good hiding spot from the ex … that’s got underage all over it.
Nah, I’d totally understand it if you had minors doing those acts… happens today with teenagers, how many “wait” until they’re 18 to get frisky if given the chance? Some do, but not most, and I try to write with a fair bit of realism to it. And even if the teens aren’t actually getting frisky, they’re dreaming/joking about it.
Even in star trek, most red shirts had a name, maybe added to the captain’s log “Death of Lt Smith”. So, if the character’s around for most of an episode, a name’s likely the right thing to give them. If you’re having difficulty with names, try a random name generator, that’ll suggest names fast. (I tend to use http://random-name-generator.info/random/)