Isn't this a bit unethical?

Kosuke doesn't want to tell Haruka that he's an omega, but isn't that kinda messed up? In an omegaverse, I imagine there'd be probably some laws/policies about that since pregnancy can occur and you don't know someone's secondary genders when hooking up with them; it's not like IRL where a hetero couple knows what gender the other is when they have sex. I know it works out in the end, but Kosuke wanting to keep it a secret but KEEP HAVING SEX is...not a great move.