Yukari's is pretty suggestive though, right?
Actually of the girls I remember I can only think of Mitsuru, Aigis and Elizabeth being overtly sexual. Yukari's I don't think is, because I'm pretty sure she tells you she didn't mean what you think she meant. Of course
in March when she asks you to meet her mom or whatever, then she's being suggestive.
On the female side, likewise, I only remember Theo and Shinji being suggestive. And Aigis. Akihiko was much more innocent and Ken I shut down because no way was I doing that.
As to P4 I don't know about the other girls, because I only followed the Rise option through.