How do you KNOW that your partner is cheating on you? This is the proverbial “smell of sex” that I'm talking about – you can smell that on a person, if you get. Dec 8, - Can a woman tell if her boyfriend/husband is cheating by simply smelling his penis? Nah, the cheater is smart- he cleans himself before coming home. On the other hand, if he The pubic hair retains the smell of the previous your girl has never had any issues with her private area and.