GenePartner
There comes a point in every relationship where you must ask yourself "Is it worth it?" -- usually around the time she forgets the anniversary of your first kiss, again. Quit searching your feelings, and let science be the judge: GenePartner.
If for some shocking reason you're currently single, GP provides tests and GenePartnerIDs for bachelors, which you can use to screen potential mates -- though even the deepest genetic connection will be destroyed when you whisper, "I want to stick cotton swabs in your mouth."