Yeah, I would like to know this as well. I mean it's pretty obvious that /b/ is inhabited by mostly males so it would beg the question as to why any women at all would want to be here.
Of course, it's always safe to make certain connections and ask why men are here. Well, they are probably either A) bored B)have no life C)are looking for some quick laughs. I mean I could honestly see women going on for those same reasons. Hell, even to post tits, idk...