Since when are sims so freaking needy?

I'm having this issue as well. My sim's house is set to private dwelling, no trespassing on the door, and she keeps her door locked and still sims keep walking in uninvited. She's living in Brindleton Bay not Sulani and I don't even own Eco Living, so I can't imagine what's causing it. Justin Delgado had the nerve to waltz in, go right into the bathroom where my sim was having a pee and gave her an embarrassed moodlet for however long. It's most irritating.