There is nothing like the energy of group sex when the majority of the participants are on the same wave length. I was young (late teens, early twenties) in the early eighties in San Francisco where straight or gay, group sex was the norm. Those rainy winter nights were the best, me fucking a girl why a dude fucked me while I'd go down on another guy or lady were the best. The fewer taboos the people in the group have the better the wilder (and of course hotter) it can be. It's a time of be as flexible as possible (both in body and in attitude), but go for it, each and every one of you, whenever the opportunity presents itself.