This is really hard (no pun intended !) to answer. Humans are sexual by nature and sexuality is not black and white, lots of shades of grey. One of my best mates is 100% straight, he has no interest in other guys cocks. He loves his cock though and loves to show it off. Yes he does wank with me and our other two close mates in circle jerks and watching porn. We even share beds together naked at the weekend staying over at each others flats. Yes we do wake up with erections, most guys do and no we dont hide them. We are very comfortable with each other and our bodies. I am bi but can separate my love of a guys cock and being naked with a mate. So is it gay to jerk off with a guy......well that depends on the guys motives, no "straight" answer! In my straight mates opinion no, it is just about jerking and bonding with mates. Has he touched my cock, yes he has. Does this make him gay, of course not. Has he done it out of curiosity, as part of our close friendship, well both really. Another "straight guy reading this will possibly disagree but isnt that the amazing thing about our sexuality. I say it really doesn't matter putting labels on ourselves, if you are curious about touching a guys cock just do it, don't worry about "is it gay", it doesn't matter.