I'm probably going to be having my first threesome on Friday. It's with two friends, one of which I've already fucked around with. It'll be two girls and one guy. Does anyone have any advice or tips and some positions that are good?

**UPDATE**

So this is going to sound stupid but it didn't happen. I decided I didn't want to and right after I dropped out the guy didn't want to fuck my friend anymore because he likes someone and doesn't want to be a fuck boy I guess.