SUBREDDIT: r/relationships
TITLE: In an open relationship with GF [21] who recently went to a sex club, and loved it, I [20] am feeling crushed.
POST: My GF and I are in an open relationship of 1.2 years, I am fine with her sleeping with another guy once a month or so, and preferably someone I know or can track on facebook, get their number from my GF. I also sleep with other women, but not much at all and we have strict rules of always telling one another. 

My GF went to a high class sex club and ended up fucking 3 guys, blowjobs, handjobs and penetration vaginally. She loved it and wants to go back more often. I feel absolutely crushed, my masculinity hurts, I feel like I'm not good enough, and my value is dropped. I cant protect her from the people at these places if they decided to kidnap her, but when I tell her I want to protect her, she feels insulted that I would consider her dumb enough to get caught or need "protecting".

I've told her I would like to come to these events when she wants to go (this costs me about $120 each time) but only when she goes so I can grasp some peace of mind. She does not like this idea and calls me trust of her into question.

I dont know what to do, is it acceptable to let her go back to these places often and take 3,4,5 or however many cocks in one night while I'm not around to protect her if something goes wrong.

She's already been given a card from one of the guys indicating his mansion is available. I feel sick about this, but she told me that she wont be going to it.

She got home by getting a lift from one of the guys there, I was filled with fear when she told me this. What if they decided to take her?

What do I do? It's killing me.
TL;DR: 
Gf loves going to a sex club, getting lots of dickings, cant see why I'm upset at her want to constantly go back even without me.