Do you suspect your spouse is cheating? Are you paranoid about your teen having sex? These are just a few of the suggested uses for the Semen Detection Spy Kit.
Available on Amazon.com for $40, the test looks for Prostate Specific Antigen, a protein found in seminal fluid. It's so accurate that you can use it to detect 30-year-old semen stains, assuming you have some parachute pants that haven't made their way into the wash yet. [Inventor Spot]