With intercourse the erect penis slides into the vagina. By moving the penis back and forth there is friction between the penis and the vagina, which is exciting for both the guy and the girl. But that’s only the case when the vagina is moist and slippery. A dry fuck is rather painful.
·        Most people first make love in other ways before they start having intercourse, like kissing, hugging, petting or a dry hump. At the age of 17 less than half of the guys and girls in the Netherlands have had intercourse.
·        Intercourse can lead to pregnancy and give you a STD. To do it safely you have to use a condom, possibly with an additional method of birth control.
·        You can have intercourse in many different positions.

Orgasm through intercourse?
How to enjoy it more: some advice
Ways to move during intercourse
Painful intercourse (for the girl / the guy)
How can I prevent my penis from slipping out during intercourse?
We tried to have sex but his penis doesn’t go in. How come?
How can I make intercourse more exciting?

See also: The CAT technique