so i thought this comment made in the sexaholics group pretty much summed up what i wanted to say (the discussion is about why guys are sometimes less than rock hard in bed):
Drago said:
Think of any reason that a woman would say no to sex: too tired, too drunk, not in the mood, have to pee, hungry, pissed off, want to do something else, have to get up early in the morning, etc.
Men don't want to say no to sex when it is offered so they do it anyway, even if they aren't physically or mentally prepared then. So even though their bodies can't perform, they try to do it anyway, and the sex is sub-par.
If we got offered sex more often, we would feel better about saying no when it isn't going to be any good. Then we would only have sex when we were going to be able to do it well, and everyone would have better sex and be happier.
Summary: Offer sex more often, and it will be good sex more often.
not that the sex is ever bad 
only that sometimes i want it again an hour later.
