It's the same reason why you look at other women when you walk down the street. Your hormones are still working.

I don't get you guys who let their women leave the kitchen

I wish I could help an offer some good advise, but I have zero to none experience with women. Having that said, what D21 posted is probably the best answer you can get.

I wouldn't worry about it, most women are disappointed by their partners to start with, they just don't tell them about it so they won't hurt guys' ego. Worst thing she'll do is prolly suck some random guy's dick for a little so if you find that disturbing and don't want to touch another guy's dick in your mental image then just don't kiss her or have her give you oral for like a week or 2 before you forget about it, she'll prolly just thinks you are jealous and find you cute but in reality, you just don't want dick after tastes.

I was gonna say D21 has it right, but NiKKoM obviously knows better.

Anyway, as long as there's no touching you could always think of it as live porn. If it is such a huge issue for you though and it's just a "if she was invited to one she'd definitely go" thing for her, than you should be able to talk about this with her without stirring too much of a problem.

No one in history has ever been 100% sexually satisfied with their partner at all hours of the day forever. Pornography, strip clubs and masturbation can coexist with a healthy relationship, as long as you remain open with each other.

She may also just have a social need to do this because her friends are.

Tell her it makes you feel uncomfortable but you'd respect her decision either way. The most important thing is you keep talking to each other about how you feel. 

Yea, you need to relax. Let her go, and don't give it another thought. If she's going to cheat she's going to cheat regardless. The strip club or night club isn't some tipping point or magical place that brain washes women.

Wisdom right here.

Is it better now?

>:(