Serious answer. For me, the opposite of above. Even if it wasn't always the same actual guys doing it together at that moment, it's been mentioned many times. Many times! It seems to be a right of passage for some; typically involving a group of guys that are friends, not uptight, probably alcohol, no females, low lighting. In general, it's not homoerotic, it only happens once or twice, and it's fairly well documented world-wide. As opposed to what often seem to be fantasies of straight guys turning gay, I think these usually are straight guys that just wank off together a time or two, and go on with their straight lives. Personal experience, many stories heard, very common in all-male situations (military, camping, etc.)