Rule of sexual bragging. If you can do it you don't say it. Yes, I've heard guys say stuff like this. These guys were all obviously virgins who sucked at life.
My experience validates the notion that those who know don't say, those who say don't know. But even though I've been on sports team locker rooms, gym locker rooms, team buses etc., I have never heard anyone brag about conquest-by-assault. Far more common are the losers claiming that they have to fend off the advances of women...
Bragging among peers is always an attempt to raise one's status in the group. This is a very complicated social transaction, because one is attempting to change how others view oneself.
If one over exaggerates, the group knows the brag is untrue and status drops, so the more subtle boast is usually better received. This is the real problem with "locker room talk". Everyone knows they are the subject of a sales pitch, and the product is the bragger's status and ego. There is an added element which is better appreciated as men mature. Bragging about sexual exploits exposes one's intimate life. In the real world, where we work and have to interact with many people, this creates a vulnerability. Intimate details are best confined to intimate friends.
It's easy to imagine a situation where a locker room boast could be repeated and your boss realizes you are the one who left his drunk daughter on the door step with her panties on backwards. It's not your fault you didn't know her name, or your bosses address.
Group status is a strange thing. In order to obtain it, one must do things the group admires. If one is part of a stupid group, stupid things rule. This is how extreme skateboading evolved.
For myself, I think the locker room braggart is more of a mythical creature, than a real person. We'll leave teen boys for another discussion, so this is about grown men. There are so many ways that exposing one's intimate life actually damages one's status, rather than enhance it, most men simply avoid doing it.
Those who do brag about such things, hope to raise their status, but the real result is, their veracity and their judgment are questioned.
