⭐ Merited by Foxpup (2)
It's an unusual bodily characteristic to be attracted to, if only because gametes can't be observed with the naked eye, but if semen analysis and ovarian function tests are what gets your motor going, then who am I to judge?
Slight correction: A human egg cell can measure up to 120 microns in diameter (0.12 mm), which is indeed visible with the naked eye! I know this because I always request that prospective sexual partners menstruate in to a suitable container which I can rummage around in to identify the ovum prior to copulation. Although once I mistook a speck of dust for the aforementioned gamete, so I don't think I can call myself SuperStraight anymore. 
Or maybe because of all the orgies. Who knows?