Seriously though, this is the wrong way to ask this, and even the wrong website to try it on. I would suggest finding a chick on OKcupid or Tinder first and suggesting it to her at a later point. It would do well to up your suggestion tactics as well - most people want to know what they are looking at before they agree to have sex with someone. Looks, location, STD results, sexual experience... All just slightly important!