My lovely girlfriend, 20F, and i, 25M, have known each other for about a year now and have been together four months. We are completely in love and most things in our relationship are going smooth except for one, our very different libidos. For reasons i won’t go into she can pretty much happily go for weeks without any sex at all. When she does finally need sex, she’s feral! But after those two or so days of amazing sex she’s pretty much good for a whole month. I on the other hand have a “normal” to somewhat high-ish libido. A week is as much as i can comfortably handle, beyond that is a conscious effort to say the least.

Naturally this has been the one point of friction for our relationship. After many, many, conversations, solutions, trials and errors - she has suggested i get a second girlfriend.

She laid out some basic rules of engagement for this arrangement and put it on me to see if i am open to that solution and, if so, to draft how this would work and we’ll take it from there.

She says what she’s getting from me is enough and she only has the bandwidth for one man at a time but wouldn’t mind a “sister wife” if she covers those of my needs she can’t meet and they can get along well.

My question to you is this:

1. Advice on how a polygamous relationship can work
2. How does one meet someone who would want to join such an arrangement
3. Those in polygamous relationships, would you advice getting into one

To answer a possible question, yes, i am open to getting a second girlfriend. I would only want:

1. Them to know each other
2. Be aware when i am with the other
3. Be at the very least civil with each other

TL;DR: My girlfriend has an incredibly low libido and she’s suggesting i get a second girlfriend, make our relationship polygamous, as a solution to our sex problem.