As much as we hate to admit it, you can tell when a person has had sex - especially when you're the only person that they should be having sex with. Their hair might be damp, they'll smell of sweat and they'll also give off the scent of the other's person's perfume or aftershave. However, they'll also be showering more because they'll be wanting to be sex ready for the other person; after all, every time they leave the house to meet them, they're going out on a date.
