I always thought it was odd how, no matter how close they were, family members and friends would complain about your Sims being "inappropriate" if they tried to do something like cook a meal when visiting. It's also annoying seeing this crop up with romantically-involved Sims, just because they don't live together. This mod basically takes the functionality of the "Always Welcome" trait and expands it to other types of relationships, allowing you to cook, shower, and sleep over at another Sim's house as much as you like.
The following relationships are 'protected' by this mod:
Best Friends Forever
V2 includes all of the above relationships, in addition to Friends and Lovebirds. Choose only one version.
Add-Ons No Inappropriate Toilets
Disables the embarrassed buff when Sims walk in on a good friend/BFF or family member using the bathroom. By default, only romantic relationships are affected. (Sorry for the terrible filename.)
This mod was made and tested with game version 184.108.40.2060. It overrides the following XMLs, and may conflict with mods that edit the same files:
No Inappropriate Family and Friends