Sounds like you don’t understand gender bias

I assert the same want ad for sex partners. Sexism gets a bad rap.

There are reasons why (legally) you're not allowed to discriminate in the workplace based on gender, but are allowed to in selecting a partner. They're not the same, even a bit. If anything it's just a (slightly) witty analogy. You already know that.

If people want to play the 'free to discriminate against particular group identities' - I'm game. Let's see how that one plays out.

I didn't want to say it at first, for fear of invoking dang, but I am talking about the workplace. I was referring to prostitution, which is as valid a professional environment as any.