This is why it's great to avoid attachment and putting all your eggs in one basket.
If I am seeing a girl and she pulls a trick like this, there's 4 waiting to fill her shoes and would do a much better job at blowin and ridin...if married and mortgaged, tough shit 
Saying that, I know a married friend of mine and he barely satisfies his wife when on 750mg test, she has to get drilled regularly and he can't come off high test cos if it lol
Like somebody else said, communication is key.
Every girl I have ever dated seriously, including my present GF...is well aware that is unacceptable.
I'll never be "that guy"...the poor bastard that has to go eat shitty wings at Hooters to have some kind of interaction with a set of big tits. And has shitty sex 4 times a year with his crappy wife. I refuse, I'll fuck someone else ...100% serious.
Not trying to sound like Joe Cool....its commonly accepted most women would never seriously date a guy that didnt work and had no ambition.
I would never seriously date someone who didnt enjoy sex and didnt have a healthy sex drive. It's just as much of a reason to end things.
And its out in the open with me, I've said this to her face....LOL