16 of 18 things You Didn’t Know About The P*nis

17. Koro, a culture-specific syndrome, where a man (or a woman) is overcome with a debilitating fear that his p*nis (or her nipples) is shrinking and will eventually disappear.

Interestingly, this fear is borne out of no real proof or evidence. It is also known as “man-hood panic” and has been said to provoke mass hysteria.

18. Semen can cure depression:

Apparently, semen contains chemicals that elevate mood, increase affection, induce sleep, and contain at least three antidepressants. It also contains cortisol, which is known to increase affection; as well as estrone, which elevates mood; oxytocin, which also elevates mood; thyrotropin-releasing hormone, which is another antidepressant; melatonin, which is a sleep aid; and serotonin, which is a well-known antidepressant neurotransmitter.