If that's not a thing, then this law just does absolutely nothing!
But of course it is. I mean I feel pretty annoyed and it is also a health impact if someone is smoking next to me at a traffic light. So it hurts me, but is not illegal (I think it should be but that's besides the point). Someones place of birth should have no impact on the consequences of such behaviour.
Artificial semination is key to commercial animal agriculture, and that too would be unambiguously rape in human standards. Not to mention the horrific living conditions of most animals farmed for meat.
It's really just because one has always been normal, and the other hasn't, aka it's cultural. It's not rational. Though there's also arguably far more benefit in killing for meat vs. having sex with dubious consent, so that can be a consideration that isn't purely cultural.