Dude what? No. Calm down. Google Fuckboy. It’s that easy. Let me help you.

fuckboy ˈfʌkbɔɪ noun vulgar slang derogatory 1 a weak or contemptible man. 2 a man who has many casual sexual partners

So the second use case. Unless you mean a voluntary bachelor is having noncasual relationships and intercourse with one woman? Then moving in? And sharing a life?

Again, nothing wrong with a fuckboy who is open about things being casual and uninterested in further relationship development and intimacy.

It just is the literal term? Sorry if that hurts your feelings, sweetheart. Nothing wrong with a fuckboy who’s upfront.

I believe the term is “Fuckboy”.