The ejaculatory fluids of a woman, known to leave a signature scent on the male package (or face) so that your woman will always know if you have been putting that thing where it doesn't belong!
Dumb ass Ben: "I did the deed with my girlfriend this morning, nailed my secretary for lunch, did the cocktail waitress in the ladies room after work and wanked it on my drive home. When I got home and stepped in the door, she made me drop trou, sniffed my package and said she smelled another woman on me! How the hell can she tell that it's not her cootchie sauce that she is smelling, is she part bloodhound or what???"
Good friend: "No Benjamin, you're a dumb ass!"