At the end.
IMPROVING ANSWER: Just before he falls asleep.
during ejaculation
The same as anything else you digest
If your semen smells nice, your sick. Semen smells like a sort of bleach.
I don't think you came.
No. When you swallow the semen, it goes to stomach and digested. Sputum comes from your lungs.
It will come out in the wash.
Most semen is white in color, but grey or even yellowish semen can be normal as well. Blood in the semen can cause a pink or reddish color
Puberty. 12, or 13 probably.
...yeah
Most of it does. However, it can leave stains.
you get a come sandwich
It's called 'semen' (see-men) and it has sperm in it. The semen can be made to come out forcefully during an ejaculation, part of the sex act. If you can not ejaculate yet it is probably because you are not old enough and haven't got that far in your development yet. it usually starts around pre-puberty from the age of 10 and around. That is when semen can come out but semen does not contain sperms until you have reached puberty.
some semen will release when it is ready, its perfectly normal, because it needs to come out one or another!