Hookups are common among young adults. For example, one study of adults ages 19 and 22 found that 40 percent of men and 31 percent of women said they had engaged in sexual activity with a nonromantic partner during the past year, the researchers said.

How common is hookup?

Studies show that most students (most recent data suggest between 60% and 80%) do have some sort of casual sex experience. Of those students who have hooked up, between 30% and 50% report that their hookups included sexual intercourse.