Im assuming you are asking about STI's swallow or spit but don't hold it in your mouth, as a guy I could care less if you swallow or not, I just don't want you to stop doing what your doing right before the main event occurs.
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
if you want
You could perform fellatio (oral sex). You decide if you want to spit or swallow.
you can swallow the semen. yes, some people do it because it is a "turn on".
Clearly, yes.
no
No it won't do anything, but why would you?