Morals are personal, not absolute. If you find it immoral, don't do it. If you have no moral problem with it, then fine, do it all you want.
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 can swallow the semen. yes, some people do it because it is a "turn on".
Clearly, yes.
no
Yes
No it won't do anything, but why would you?