Sex threads are always an exercise in futility on GAF. You have too many people, from too many different cultures/religions from all different age brackets.
From a practical side, it's probably good to marry a man/woman with less sexual experience/desire. Because marriage is hard and it's one less thing you have to worry about. Once that boundary gets crossed, it's usually game over.
But just because someone is a nympho at one point in their life, doesn't mean that behavior keeps on the rest of their life. People change as they get older/wiser.