Well first of all you can do this by sexual intercourse or masturbation as well. First what happens is you get a tingling sensation and the sperm travels down a tube and comes out your hole. If you're talking about taking sperm out of a girl, that is physically & mentally impossible.
Of course! do you think he can get ALL the sperm out
definitely
Of course.
They fap
No.
No.
No.
Sperm is designed to go inside a women so it can't hurt if you take some on the face (or the eyes, the hairs etc). Moreover if sperm was corrosive or toxic, every man would lack his right hand.
i don't know my friend!
masturbating
Detergent and water.
No