Yaa and this is because of Testosterone!! Whoever says women loves sex as much as men it's a lie. We have testosterone 12-14 times greater than what women creates. And testosterone is a big factor in arousal and wanting to fuck the girl u liked right there right now. But women can be more sensitive to change in testosterone which they secret. If a women gets a tiny bits of it, she will get super horny and aggressive too. So if a women is frequently having sex, she probably will have more testosterone in her system than she used to....hence why they keep wanting it. Plus their orgasmic chemistry has some hand in this too.