So my gf has been pretty unsatisfied with our sex life for a while now. She's been jokingly/teasingly saying that she'll start sleeping with other men soon if I can't fix my problems (I often can't get hard enough/keep it hard enough for sex so she gets frustrated). I've always thought that the idea if cuckolding is hot, so I started encouraging her a little and now she has actually planned a date with a guy. I'm quite surprised at how fast she planned it; just a day after I gave her the okay. She says she doesn't want to do hook-ups, and we both didn't think it would be the best idea to straight up telling him that she already is in a relationship, so she told him that she's just looking for something casual and then the hope is that they become like fuck buddies, for now. We haven't really set any long term goals for this yet and she said that if I feel uncomfortable with it, we will stop it immediately.

I have numerous concerns with the whole thing. Off the top of my head, these are:

• that she'll really like this guy and want to keep seeing him even if I feel uncomfortable with it.

• that it will impact how often she wants to have sex with me.

If anyone has any experience with something like this, what should I expect in terms of her behavior? And any tips for someone starting out?