After some age, every man masturbates. This may not be scientific fact but it's a fact. Some do it more, some do it less, some stop after a certain age, and some continue even after having a sex life. And at the end of every masturbation process, a whitish substance comes out of the man's body and it's called 'semen.' The funny thing is we were all inside semen once. But do we know everything about this thing? Well, today we're going to learn many things about it. It's education time!