You´re not wrong there. It almost seems nonsensical to have the girls have different personalities during normal playthrough but during sex scenes they all become sex demons or something. Not that I´m complaining about them.
I feel that as the updates keep coming we will see more variation in the type of sex they want. So far it´s always been rough and I´m expecting Dalia to be the same. Annie and Luna will probably be the first ones to have a more gentler scene, I´m assuming. In the end they all will have at least one sex scene on either side of the spectrum, but for now, I want to see Dalia get demolished.