With us guys, from about 2nd grade onwards, we talked A LOT about sex!!! The only other things most of us are interested in is cars, guns, explosives, sports and, in later years, booze and drugs!!
VERY RARELY do you find a guy that DOESN'T have sex on his mind at SOME point in every day!! Just about EVERY conversation, no matter how old you are, can, at ANY point, be turned towards sex!!
One night, I'm shooting pool with a few guys and one guy was debating how to make a certain shot. A girl they were friends with said to him, "You want ME to put it in for you?" IMMEDIATELY, another guy in the group said, "I'll bet you say that a lot."
In trying to construct something, one guy might say, "So, that pole has to go into this slot." And a guy there with him would say., "That's what SHE said!"
It's called, BEING A GUY!!! Nearly EVERY guy does this!!