My friend invited me and some other guy to his house today, we had a barbeque watched a film and before we knew it we were talkin about sex by midnight. At first it was awkward because his girlfriend was there but she started to get into it. So to cut to the chase, we ended up having a threesome (me, a friend, the bf and the gf, if you want more details just ask) We're all straight guys but I kept noticin that one of the guys kept looking at my cock alot. We were pretty much equal size except for the boyfriend. The guy who kept looking was slightly longer but i was alot thicker. Well anyway, after he kept starin at my cock I wondered...is this guy gay or is he just curious or something? He's usually acting like a homophobic type of person but I'm just wondering is it natural a guy to stare at another guys cock during sex for a long time or is he gay\curious?