3.4.7 Sex - Threesome : The threesome is just the fact of having sex with 2 partners at the same time.
There are 2 kind of threesome. The MMF (male, male female) with 2 guys and 1 girl and the FFM (female, female, male) with 2 girls and 1 guy.
If you never did it before, I advice you to start with a FFM (that’s more easy). Then when you’re OK with the fact of have sex with more than one person at the same time you can do the MMF.
Note : For many girls that like anal sex, the best sexual experience is the DP (double penetration, one cock in her ass and an other one in her pussy).
Just remember for a better experience that guys should get in and out at the same time.