Another study shows that once a person has sex for their first time, it becomes less of an issue or big deal to future relationships or hook ups.
The term's definition can vary depending on the person or on the age group.
It can range from acts that involve kissing, oral sex, or intercourse.
Another study was based on a survey of over 18,000 college students from ages 18–25.
This survey asked questions like how many sexual partners they have had since graduating high school, how many sexual partners per year, and how many times per week they have sex.
Some worry that if society disconnects intimate sexual behavior and emotional connection, teens who hook up will have trouble forming stable intimate relationships later in life.