Semen is not known to be harmful to swallow. It may even possess protein. The only deterrent may be its taste.
Depends, if you truly want to or not. If you don't like the smell of it or the taste of it the first time then don't but its not harmful to the body.
If you swallow your own semen, then no, you can't get anything new. It's quite safe. It's fairly safe, too, to swallow someone else's semen.
No. When you swallow the semen, it goes to stomach and digested. Sputum comes from your lungs.
After all there is no harm in swallowing your partners semen.
no good mon
yes
The same as anything else you digest
No. Diabetes does not alter the taste of semen. Please see related question.
if you want
you can swallow the semen. yes, some people do it because it is a "turn on".
Clearly, yes.