You are thinking of sex way to special then. Alot of people just have sex, for sex. Both men and women. And especially in Japan where there is alot of sexual frustration combined with high stress levels sex is a great outlet to calm down some. Therefor its more accepted to have sex just for the physical act of it, ergo the major love hotel industry. And ofcourse what Nyororin said adds to that tendence.
There are actually some intresting articles circling around the web concerning the, what westerners more or less describe as, the perverted nature of Japan.
I just think its awesome. Then again, dutch tend to be rather liberal about that stuff. So are most belgians.
