Casual sex or hooking up is "cool" among teenagers and youth.
For men, casual sex is more exiting to them because of increased perceived mutual attraction and sexual variety. For women, casual sex is more exiting to them because they could be more hypergamous in their choice of men.
Females have higher standards for who they choose to have casual sex with than men. Physical attractiveness is the most important when it comes to casual sex. Females are highly selective when it comes to casual sex not because they dislike casual sex. It's because women know they could get the hottest guy for casual sex.
“I will go out ‘sharking’ – with the specific intention of finding a hot guy to have sex with – and I’m usually successful,” says Milly. “I don’t have a boyfriend, but why should that stop me enjoying sex?” 
Female teenagers feel awkward when discussing casual sex to their parents. This is because many parents condemn casual sex, particularly to their daughters. Brothers also condemn casual sex to their sisters. (See Familial slut-shaming).
For this reason, many females choose to attend a university far away from home.
- Regan, P. C., & Berscheid, E. (1997). Gender differences in characteristics desired in a potential sexual and marriage partner. Journal of Psychology & Human Sexuality, 9(1), 25-37.
- Regan, P. C., Levin, L., Sprecher, S., Christopher, F. S., & Gate, R. (2000). Partner preferences: What characteristics do men and women desire in their short-term sexual and long-term romantic partners?. Journal of Psychology & Human Sexuality, 12(3), 1-21.
- Schützwohl, A., Fuchs, A., McKibbin, W. F., & Shackelford, T. K. (2009). How willing are you to accept sexual requests from slightly unattractive to exceptionally attractive imagined requestors?. Human Nature, 20(3), 282-293.