Rule 64 states that the act of "bragging" about female "conquests" is disallowed. This is due to the negative global image such a depravity places on the art, as well as the decrease in social worth for the individual as those who are extremely successful feel no need to broadcast the fact.
Joel: "Duuude, I got soo many bitches last night, call me Mr.Bitches"
Josh: "Im'a call you "Bitchy" if you don't shut up. Rule 64 of the Player's Rulebook. You obviously never get any. Bitchy"