>>281708719
If you mean harem, have you read Mushoku Tensei? "Irresponsible playboy who cheats on his three pregnant wives every second" trope is very obnoxious to watch. One would want to reach into the screen and strangle him to death.
If you mean monogamous relationship, French cartoons often have that. Boy and girl actively date each other, and there's none of that "oblivious" crap that's prevalent in both American and Japanese animation.