Should you have a MMF threesome with your girlfriend?

You may have been talking about trying a MMF with your girlfriend (a threesome involving another guy), but how do you know for sure whether it's going to work out fine?

Here's a quick check list of things I've noticed was of concern to me:

Jealousy Test

Make sure you won't be jealous. A good test is the following: ask your girlfriend to describe one of her wildest sexual adventures she's done before (presumably with only one guy, but nevertheless). If you get turned on , great! If you feel jealousy, well, then you're not ready. It doesn't mean you never will be, but you'll need to work on getting used to your girlfriend's stories before you actually have an MMF.

Reverse Jealousy Test

She also needs to know you won't freak out if you see her fuck another dude. Once you've past the jealousy test above, you can (pretty) safely reassure her by explaining that her past adventures only turn you on.

Experienced Third

Make sure the guy you invite has experienced doing MMF before (not just "threesomes", as this could mean MFF). Why? Because most inexperienced guys have penis aversion, and they just can't get hard when it's time. So ask him (through email/internet) about his past experiences, and be a good judge of character.

MMF Dirty Talk

Dirty talk about what to do during a MMF. You'll find each others dos and don'ts. The don'ts are the ground rules you should set during the MMF (that's the rules you tell the male guest to respect).