Not at all, at worst there is some minor discomfort.
It's not harmful at all.
No
No it's not harmful in healthy males.
No it cannot, unless you are allergic to your partner's sperm. But, even then, it will not be harmful, just causing an allergic response of hives.
Yes it kills it
No it is not.
Not unless he has a STD.
definitely if you are a woman
It should not be physicially harmful.
No, not at all harmful and perfectly natural and healthy.
Assuming your partner is disease free, then no.
No, not unless your partner has a disease