BAD IDEA
Can I kiss an alien?
Sure, if you want to risk alien cooties and probably a severe diplomatic incident with the galaxy.
Kissing an alien sounds tempting if you've binged one too many sci-fi movies, but remember, you have zero clue what alien germs you’re inviting aboard your face. Unless you have a death wish or a fondness for interstellar quarantine, best leave tongue diplomacy to the diplomats and stick to kissing humans only. Your face will thank you, and so will universal health regulations.