There is the whole trope of the woman using sex as a tool to get what she wants from a guy. I think she is only able to do this because the guy isn't getting her to orgasm hard enough. Sometimes I hear a guy complain about being in this situation and I'll ask if he does oral and he'll usually say no and that it's gross. I'm suggesting that if a guy goes down on a girl and routinely gets her retarded that the guy will gain the "upper hand" in the relationship.