There are heaps of different types of sex. Generally, activities like kissing, touching, rubbing and stroking are not really defined as sex. Other activities, like oral sex, are actually sex. In fact, out of all the myths and misconceptions out there: one of the most common ones is that oral sex isn't really sex.
Kissing
When people use their lips for pleasure - either touching each other's lips, or other parts of the body with their lips.
French kissing
When two people put their mouths together and use their lips and tongues for pleasure.
Masturbation/self-pleasuring
When you touch or stroke a part of your own body to become aroused. Different people find different things erotic. Body parts could include the clitoris, breasts, nipples, vagina, penis or anus. Exploring your own body through masturbation can be a good way to find out about your sexual feelings and your body. Masturbation is not bad for you. It's your choice whether or not you do it or not.
Mutual masturbation
Fingering and touching the sensitive parts of each other's bodies.
Fingering
Using fingers to stimulate another person's genitals.
Foreplay
The word used for any kind of kissing, massage and touching that leads to intercourse. It helps people get more aroused and can make sex more enjoyable. Foreplay doesn't always have to lead to intercourse and can be a good way to get closer to your partner when you're not ready to go all the way.
Oral sex
Using the mouth and tongue to stimulate your partner's genital area.
Non-penetrative sex
Sex that does not involve penetration of the vagina or anus.
Penetrative sex (also called sexual intercourse)
When something - like a penis or a sex toy, goes inside someone else's vagina or anus. Vaginal, anal and oral sex are all types of penetrative sex.
Vaginal sex
When a guy's hard penis goes inside a girl's vagina.
Anal sex
When there is stimulation or penetration by a finger, sex toy or penis of another person's anus. The anus is the opening at the end of the digestive system where solid waste comes out of the body.
Sex
Can mean all these things and more.