Why would you have a consensual sexual encounter with another man if you're heterosexual? I'm experiencing one long processing error as I participate in this thread. My brain isn't equipped to compute this, but the take away is that the term "bisexual" means "attracted a lot to both sexes", and the term "heterosexual" means "attracted usually to one sex but not necessarily only to one sex". As yet there's no term anymore for someone who is only attracted to one sex. It would be simpler if "heterosexual" were that term as many thought it was, but apparently that's stupid because close mindedness and bros and threatened homophobes and stuff.
Well, again I used sexual experimentation at puberty as an example. This isn't something I did myself, but I know it is supposedly common. I can see how children might experiment with each other simply for the fact that they are sexually curious. I am not really talking about anal sex, but rather other sexual experimentation.