I think much of the casual hookup pathos is in not knowing what we want. Your point about a lack of sex education is too true. We grow up in a culture where simply TALKING about sex is taboo, whether to our kids, to our students or to our partners. Maybe people go into casual sex simply to figure out their own sexual proclivities and what they truly want/need. I think that it’s unrealistic to expect ONE person to fulfill all our needs (sexual or otherwise), but the idea that people are disposable really bothers me. Intimacy and monogamy are neither exclusive of one another nor identical. I know plenty of monogamous people who have intimacy issues and plenty of polyamorous people who have intimacy without sex. Figuring out one’s own needs is a big step towards getting satisfaction in all relationships.