<human>: Can you succinctly summarize the text in 1-3 sentences?

Relationship: M27, F28, 1.5 year duration.

Our relationship was monogamous until recently. She has a non-existent libido and sex is usually uncomfortable or even painful sometimes for her. How often we have sex is often an issue. 

One day out of the blue she told me that it was fine for me to seek sexual relationships with other women. 

The only rules were that it can't be with her close friends. Always wear a condom, and never in our apartment. She doesn't want to hear the details of about it. The final rule being that she can change her mind later if she wants to know details about my sex life. 

She has this idea that I can just walk outside and I have to beat women off of me. That they all want to have sex with me and I've been telling them no. I ask why I think that, and she says it's because I'm very attractive. Which I'm not. I'm not ugly, but I'm not drop dead gorgeous either. I'm certainly not the guy all the girls fight over or approach on their own at a club or a bar.

I told her it probably be at least 6 months minimum before I found someone, maybe even a year. She just refuses to believe it will take that long. Meeting strange women and charming them into bed was never a strength of mine. Everyone I've ever slept with has been connected to me already in someway. A friend, or a friend of a friend. Someones cousin. Something like that.

I don't even know how I'd go about meeting a strange woman let alone charming her panties off.

**How to approach telling them about my situation?**

I don't even know how to bring that up. It feels wrong not to bring it up, like very unethical to not mention my girlfriend, but I don't know what to say. "Oh, by the way, I'm already dating someone but we have an open relationship and I'm just interested in hanging out, being friends, and potentially hitting that"?
<bot>: How to I tell women that I want to sleep with that I'm already have a girlfriend and I'm not interested in romance? Or rather what is the nicest way to say that?