Too much skin, that is. Traditional morality was against both immodesty and recreational sex. In modern times, both immodesty and recreational sex have become more accepted. But I wonder if the happiest combination might be acceptance of recreational sex but still requiring modesty. People would wear loose fitting clothing, no sleeveless, no low-cut, no leg above the knee. So you'd have to pick someone for a hook-up/P4P/private lap dance because you liked their face mostly.
The point being, when you see someone's naked body, you'd enjoy it more if it didn't have to compete with the tens of thousands of other naked bodies you'd seen in pictures, movies, at the beach, stage dancing, etc.
Kind of analogous to drinking in moderation. If you have a beer every night, and a few extra on Friday and Saturday, you probably enjoy drinking more than somebody who drinks a six pack every night.
Never too much skin as long as the chicks are HAWT!!!