I went out with a WG for a while a few years ago. She suggested it after I'd seen her a few times and got friendly. I thought "free sex!" And went for it.
It was a fucking nightmare.
She was even worse at arranging her private life than she was pro$$ying. We were "together" about 2 months and she started talking about marriage
Her family was fucked up and she had two kids from different fathers
She fucked like a belt-fed mortar though.
In the end I got sick of her shit and no-show weekends and when she mind-game dumped me, I didn't bother talking to her again. I had the last laugh though. A couple of months after we split she phoned me in floods of tears begging for help that a old mate if mine (I'd moved with work by that point) was banging on her door trying to get in. Turned out they'd hooked up on Facebook as soon as we separated and he turned out to be a tad possessive
As others have said, a WG's lifestyle is a very unique one.