It used to be called a "one night stand" -- now simply referred to as a hookup -- casual sex without the emotional attachment that comes with a serious relationship.
To no one's surprise, it's more common on college campuses than just about anywhere. But a new study is providing a different look at the college hookup culture.
"The End of Sex is not about the end of sex. I'm not saying sex is over," says author Donna Freitas, Ph. D.
Freitas has spoken, written and taught college courses about religious and gender issues, and despite the title of her new book, The End of Sex, Freitas writes about the end of meaningful relationships, especially on college campuses.
"I was thinking about end in terms of purpose or meaning."
She says there's still plenty of sex on campus. In fact, the ever growing hookup culture is something Freitas has researched at private schools, religious schools, and large public universities like ASU.
"Really big schools where there is 20,000, 30,000 students, you will definitely find hookup culture there."
It's happening in smaller schools too, but...
"The only schools that showed up as different were the evangelical colleges, where hookup culture doesn't even exist."
What might surprise you the most -- Freitas found that more than 40 percent of college women and men expressed sadness and regret about hooking up.
"I learned there is a lot of yearning out there for something else for something other than a bland old hookup," says Freitas.
And as Freitas writes in her book, most college men said hooking up wasn't even about the sex.
"One of the things I learned from guys was hooking up for them was not so much about sex, it was about proving yourself as a guy on campus to the other guys. To not participate, to not be gung ho about hookup culture was to risk your masculinity and nobody wanted to do that."
Freitas says the hookup culture has only been accelerated by social media, because everyone feels the need to be so public about their experiences on Facebook and other web sites.