The easiest way I can think of to screen for a girl with an extremely low N count is to take the typical TRP approach, and if she refuses to jump into bed with me on the first meet then that's a good sign.

However, I'm quite certain that taking this approach will cause the kind of girl who saves herself to instantly disqualify me as a player. I'm looking to find a horse that I can nurture into a unicorn.

What technique should I be using to screen for a low N count?