Lovers Should Sleep In Their Lovers' Bed

One thing I'd like to see, and can't understand why it doesn't happen, is when a Sim invites their visiting lover to stay the night, they should sleep in their lovers' bed.

For example, I have a Del Sol Valley household with one adult and three teens (all unrelated) and when the adult (Jane) invited her lover to stay the night, instead of going to sleep in her bed, they went off and slept in one of the teen's bedrooms.