Yes it kills it
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.
No it is not.
Not unless he has a STD.
definitely if you are a woman
Consuming grapefruit can be beneficial as it is high in vitamins and antioxidants, which can boost the immune system and promote overall health. However, grapefruit can interact with certain medications, leading to potentially harmful side effects. It is important to consult with a healthcare provider before consuming grapefruit if you are taking medications.
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