Tell tell sign your woman has had sex

Ok, I need some help here. Tonight I had some smoking hot chick tell me that you can always tell when a woman just got done having sex because her pinky toes will be pink. Unfortunately, the hot chick is married and her husband seems like a real douche bag. Anyway, I'm currently single, so can someone please check this out for me and respond?

I know this asking allot for you to fuck your girl and check her pinky toes, but I must know.