Because men continue to secrete small amounts of semen after ejaculating, traces of dried semen stains will almost always be present in their undergarments after sex. Even if a man uses a condom during sexual intercourse or even if he only had oral sex performed on himself, there will still be traces of semen in his underwear. These dried semen stains can live on as evidence for years on unwashed articles of clothing and because of this any item that you think may have been stained as the result of recent sexual activity can quickly and easily be tested with CheckMate.

Here's how it works

For women, the most import factors to consider when using this product are the size and location of the stain in the underwear itself, as well as the circumstances surrounding the suspected semen stain. 

This is really, really simple

In the vast majority of cases a quick visual examination of the article will tell you if there is even any reason to perform the CheckMate test. In a mans underwear the stain can only be one of two things, urine or semen. Urine will stain the fabric color wise and leaves a stain that you can easily see.

Semen leaves a three dimensional stain that can not only be seen with the naked eye but that could also be felt or touched.. Semen gets into the fibers of the garment and locks it together like glue, giving the stained area a stiff, starchy feeling and appearance, what professionals call "board like."