Sims only do limited romantic interactions autonomously

The same thing is happening in my game. I'm playing on PC with no mods and in a new save file. My married couples aren't performing any romantic acts towards each other autonomously, except for giving each other massages. One of my couples, the husband has the romantic trait, and I would say he is behaving as if he has the romantically reserved trait. It is next to impossible for him to be in a flirty mood.