People define "sex" in different ways. Some people believe that it only counts as sex if a penis goes into a vagina, but this isn't true for everybody. There are lots of different ideas about what sex can be:
-Vaginal sex (penis-in-vagina intercourse)
-Oral sex (mouth-to-genital contact)
-Anal sex (penis-in-anus intercourse)
-Dry humping or genital rubbing (sexual play with clothes on)
-Fingering or hand jobs (hand-to-genital contact)
-Masturbation (pleasuring yourself)
Some people enjoy participating in some forms of sex, but not others. Other people feel more open to participating in different forms of sex to learn about what they like. Every person has different preferences and finds pleasure in different ways. It’s normal if what you like sexually is not exactly the same as someone else.
However you define it, being sexual with another person takes a lot of responsibility. Before you have sex, it’s important to think about what things you feel comfortable doing, and if there are consequences to them (like STIs or pregnancy). It's just as important to think about what you DON'T feel comfortable doing. And if you're in the middle of doing something that you thought you wanted to do, but change your mind, that's OK, too. You can stop any time you want to.
If you are thinking about having sex, talk to your partner and look into ways that will keep you both safe--using condoms (to protect you from STIs) and birth control (to prevent pregnancy).
Check out the Explore Contraceptive Methods section to learn more about your options.