No kidding. I don’t say ‘literally’ very often, but literally.
mmm
I was speaking more of an ongoing open relationship, not just a one-night stand. But I could be totally wrong, not the least because I’m currently in an open relationship with an older woman right now…
Had a girlfriend the first semester of senior year, a couple of dates that went nowhere sophomore and junior year. No dates in grad school. Moving to the big city a couple of years later did the trick, although not much was casual. Looking back, I was probably seen more as potential mate than potential hookup.
Casual college sex is one of those things made up by Hollywood.
Not that it never happens, but damn, those movies and shows make it look like college is a wall to wall orgy, and it just isn’t.
My two cents: A lot of people here are making judgments about casual sex’s morality or desirability, but I’ll answer as asked. If you’re in college now or are thinking of going (thinking of the speculation on your age here), have as much fun as you can. It is much harder as an adult.
Some of the answers here have been all about the internet enabling casual sex, but even to the extent that’s true you will never again have as large a concentration of young, attractive, single people around you at all times as you will at college.
Compare contrast:
The Adult Environment
The adult world is full of people who, on average:
- Are older
- Have kids, families, significant others, and responsibilities.
- Weigh more
- Have more physical and health complaints
- Are married or in a relationship
- Have jobs and real-life concerns (see 2 above) that soak up most of their time.
The College Environment
In college, the majority of people are on average:
- Young
- The healthiest they’ll ever be
- The skinniest they’ll ever be
- Want to have fun and explore their boundaries
- Are single or at most, in relationships of short standing
- Everyone has a few hours a day of (optionally attended) classes and on average have the rest of the day, weekends, and summer and spring breaks to kick loose and have a good time.
- At the minimum, the average college student has more free time than the average working adult (don’t kill me, engineering students, you’re like 1% of the student body).
On a macro level, which environment would you say is more likely to have better casual sex prospects?
Sure, it’s possible to make up for it as an adult. You can be a wallflower in college and then clean up as an adult due to knowing yourself better, getting more fit, getting more successful and confident…it can and does happen. But that’s highly individual, and if I were taking the odds on maximizing something like “casual sex with attractive people,” the macro environment definitely looks more favorable in college.
I have heard the transition likened to going from an all-you-can-eat buffet that lives in your kitchen to having to learn to shop, prep, cook, and clean up after yourself for every meal. But maybe that’s just overly rosy memories and nostalgia talking. 
My experience is/was that women frequently get a lot less enthusiastic or experimental about sex as soon as they graduate from college. “Sow some wild oats” is crossed off the Bucket List, time to focus on the rest of her life. Guys want the party to keep going on, but the women they used to get their freak on with are suddenly married, mommies, or otherwise have different priorities. Older men who hang around college pubs, looking for hookups with college girls, stand out and not in a good way. Everyone loves a handsome young wastrel, nobody likes an older one with a gut and a receding hairline.
YMMV.