So, I've noticed a little issue with the mod. Unless you are going into all your households (even non-active ones) and buying the female sims pads and tampons, issues happen. I feel like any households that you're not playing as should auto-buy tampons and pads for the female sims. I encountered this issue because a female sim I'm trying to get closer to is constantly angry, and that results in her being exclusively mean. I clicked the play button on her household (which is not one of the active ones), and found out it's because she has no pads or tampons and she's on her period.
There needs to be a mechanic where the female sims that you are not playing as have infinite tampons and pads or something because this is a huge flaw with the mod.
Hey.
NPC Sims do not bleed during their periods, but they do get PMS and Period hormonal buffs that might cause them to be angry.
The moment you start playing as the NPC Sim it no longer is an NPC, since you're playing as them. It does go away after you switch households though, and they again won't need tampons/pads.