Check out this eBay listing. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=5658602348&Category=11780 Preview: "Do you suffer from the nightmare of suspicion and doubt caused by the infidelity of a cheating spouse? Now you can find out what's really going on the quick and easy way with the CheckMate Infidelity Test Kit. For the first time ever you can actually monitor your spouse's sexual activity outside of the relationship by detecting dried semen stains that are left in their undergarments after sex. The Infidelity Test Kit from CheckMate can test 5 or more articles of clothing for the presence of semen. Now you can be the first to know instead of the last with the original CheckMate Infidelity Test Kit... Wow. Kind of like the CSI home kit.