Hey Zues, this is a talk a parent should have no matter what. I totally understand why this would become more pertinent if your ex's BF is moving in, even if he is not that kind of guy. These lessons will become valuable in many situations she may as well encounter. I am also hoping your exW is having these same talks with her as her mom teaching a her daughter how to protect her body and stand up for herself.
I have known some great single dads with daughters who have felt bad that they couldn't have sleepovers for their daughters on their time. They know it's not the right thing to do. My BFF's daughter has a best friend and even though my BFF's H is the greatest guy, she still wouldn't allow sleepovers without the presence of my BFF. I leave my daughter alone with her friend at their house because they are non-blood related family.
The best thing you could od is teach your daughter boundaries with her body and that she is always safe no matter what to tell you or her mother if something she is not comfortable with happened.
