Whether the people in the group freak really depends on who the members of the group are. You apparently live in the US and I know your country has more than its fair share of ultra religious nuts, so the possibility of people hyperventilating and passing out in horror and indignation at your revelation of writing gay porn wouldn't surprise me, frankly. It's something you'll only find out when you actually go and start talking to them. Besides, you only really need to tell them that you write erotica; exactly what kind of erotica should be totally besides the point.
But for the sake of your writing, learning to write other genres can only benefit your writing. You might learn different techniques, different skills, different ways to tell a story, things that you can then take to your favourite genre and improve it. Diversifying your writing skills will never be a bad thing, especially if, as you say, you want push yourself and take it further. If you have no intention of at least giving other genres a try then you're clearly not pushing yourself. That's perfectly okay, you don't have to write other genres, but you did say that you want to push yourself, and that would be a great way to do just that, not to mention taking it further. You also say that you produce little and finish even less. This could be the ideal tonic to help you actually writing complete stories. It would be so nice if you could develop into a story writer, rather than just another PWP writer.
If revealing to the group that you write gay porn is what's holding you back then the simple answer is don't tell them; just tell them that you want to develop your skill. The benefit that you should (hopefully) get out of it is too good to pass up.