He is programmed to have many mates, she is programmed to have the best mate.
When a guy starts to cum inside of me, and I feel his body tense up, I know his cum will spew out and fill my mouth, ass or pussy! She will begin to give off her own pheromones, and the two of them will become hot for each other, even in front of you! When your wife makes love with her superior lover, she becomes his mate! Later, Britney also performed for other producers, notably in the series MrNuttz Fucks Submissive Sluts.
When you smell the natural perfume of a woman, your body is processing information about her immune systems, her genetic makeup, and is calculating whether or not she would make a good sex partner for you.