Hi. I don't have sources but I think it makes sense logically.

Like if you're a lesbian and want to be with someone in a society like the one where you can't have lesbian relationship but a guy can have multiple wives, I think you'd get into the same harem. You'd consider the guy as a cost of being with the one you want.

And maybe there are good guys too, and they just let you be there and live how you like. I don't know how prominent arranged marriage is in those cultures, but some guys could be doing that and just sheltering people too.