it means 2 men and 1 women
sex
sex
It means that when you have sex it hurts, but in a good way.
sex
have sex
sex
To have sex with them.
it means you had sex with her
This refers to when two partners simultaneously perform oral sex on each other.
It means that two people had sex, when used in a slang sense.
Strictly two people
It means in a perverty way that he wants to have sex with you.