All hope is NOT lost. Per Psychology Today (et al), semen, through vaginal contact, has some anti-depressant qualities. More accurately, seminal fluid contains various nutrients and hormones that may help turn a frown upside-down via interaction with your lady smile. It does make most men pretty happy. While the science is somewhat disputed, I'm sticking with it until it's proved definitively false … yet another reason accidental pregnancy and STIs are jerks. Also, check this out: The Link Between Oral Sex & Morning Sickness
Speaking of you are what you eat, it's long been known that a man's diet changes the quality AND taste of his stuff. Allegedly, fruits improve taste (pineapple especially if that whore Cheryl is to be believed) and a diet rich in protein makes flavor go the wrong way. And on the fertility front, a diet rich in walnuts can result in "improved sperm vitality, motility, and morphology (normal forms) in a group of healthy young men between 21-35 years of age." Soy, on the other hand, has been alleged to knock sperm count down by as much at 33%.
Stay cool and enjoy a healthy diet, friends.
Glossary: Sperm is a male gamete. Semen is the fluid sperm is kept in.
Qualities of sperm: Motility – speed. Morphology – shape normality (essentially). Count – number of lil fella's per milliliter. Color, Cut, Clarity and Carat have nothing to do sperm but good scores in those departments seem to enable more of its distribution.