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I'm on the verge of having group sex (MMFF) with my partner (exgf/fwb/bi) and another couple who is in an open relationship. As an rAFC, I want to know some alpha guidelines for this situation. My partner seems VERY interested in the other guy, and she's (IMO) the clearly more attractive of the two girls. Not sure if the other girl is into me, either. I'm the leader in this situation - my idea, my place, the other couple was my choice, etc. As my relationship with my partner is pretty unstable at the moment, I'd like to know any advice or tips to make sure that the end result of this isn't me losing my partner to the other couple completely. I feel a bit jealous/insecure when my partner fawns over the other guy.
All the other cards play out right logistically. All four of us are comparably attractive, not in closed relationships, enough strangers in case of weird shit. Probably the big problem is that my partner/exgf "isn't supposed to be alone with me" cause she's in a pseudo-LTR with a guy who hates me. Her and I have been fwb for the last 5 weeks or so off and on, and she feels guilty a lot of the time for having casual sex, especially with me. Her way around this? Group sex, possibly BDSM. The other couple has been together for about 8 months and seem quite happy, but like I said open relationship. Bunch of dirty hippies, all of us

Don't listen to these haters. Group sex is awesome. It also provides a great way to 1) fulfill one of your girl's fantasies and 2) DHV yourself by being able to handle the situation in an alpha manner.
Now, first, does the other couple know the deal? Do they swing together often? It will make your job much easier if that's the case. Second, do you ever have problems getting / keeping it up? The one biggest issue I see with new guys in a swinger situation is that they can't perform with another guy in the area. If you think this might be an issue, then scrap the idea immediately.
Mindset: Sex is a fun activity, everybody enjoys having sex with new partners.. the whole point of this is for your girl to enjoy herself. You are providing this experience for her. Her happiness directly benefits you. That being said, don't be surprised if she REALLY enjoys herself. Having multiple partners at the same time is a huge turn on for most people.
Mindset about the other guy: You two are on a team and your goal is to give these girls as many orgasms as possible. Don't be afraid to work in tandem or take the lead now and then to make suggestions and reposition people. Have fun. Stop every once in awhile to give each other high fives!
Lastly, make a point to stay connected with your girl throughout the experience. Don't just swap partners. Interact with her as much as you can during the experience. When your having sex with the other girl, make a point to make out with your girlfriend, or to fondle her in some way (depending on positioning). If your girlfriend is out of reach, then repositioning yourself. Swinging is all about having sexy fun AS A COUPLE.
Anyway, I hope some of that helps.
-Wolf