My twin brother and I messed around all the time from about 4th grade to our late teens. And I don't mean a little bit of dick rubbing or jerking off together but pretty much every day. Almost every night we'd get in bed together after our parents bedroom light went off and pull our underwear off and just start humping against each other. Even when dating girls in school and fucking them, we'd come home, get in bed together and suck pussy off each other until we shot.
lol Kinda messed up to even read what I've typed but still seems perfectly ok when I think back on it. I dunno. It started slow and just experimenting but by the time we were in high school we were blowing each other and doing assplay with our fingers or screwdriver handles or whatever almost every day. We never butt fucked but got real close a few times. We talked about it years later and neither of us ever wanted to be with other guys or considered ourselves gay. He said he tried messing with a roommate in college and didn't like it. Now he's married and I've been in a LTR for about six years and probably going to get engaged soon. I've never discussed it with her and I don't think he has said anything to his wife either.
He and I haven't done anything in a long time, but I'll admit if he asked me I would do it again in a heartbeat. Honestly its about the hottest sex I ever had. (I actually got hard about halfway into typing this. lol)