I'd love if they added these and more as well. I like when my sims interact with more than just talking.
It's not the interactions you asked for, but if you're open to using mods thepancake1 has added quite a few romantic interactions, including slow dancing, intense kissing, dip kissing, cuddling standing from behind, bed cuddling, and bed makeout with the CuteRomance mod, available
here.
Several of the interactions are done autonomously between romanticly involved sims even and I really like it when I see two unplayed sims out on a date get up and slow dance or when one will come up and cuddle the other from behind.