Can sweat or tears kill germs?

Answer 1

Your tears contain the enzyme lysozyme which can kill gram-positive bacteria by disrupting their cell-walls. It does this by digesting the peptidoglycan found in them.

Secretions from sebacious and sweat glands on your skin don't necessarily kill bacteria but they do give the skin a PH of around 3-5. This acidity helps prevent colonisation by pathogens on the skin.

Answer 2

No, don't be stupid. You should masturbate, the fluid that is secreated by your genitalia dose in fact kill germs, not sweat or years.