I have a 6 year old son and my fiancé has a daughter who is soon to be 4. Over the past 3 months, she has become very sexual! She has begun regularly masturbating which we know is quite normal in children this age and are guiding her to not do it In public. However, it seems to have crossed the line between sexual curiosity and sexuality. She is acting sexual acts our towards my son and I am just not ok with it!! This has been on going and doesn't seem to improve, and it seems that it is really amplified when he is around as we haven't yet seen her touch herself when he isn't around (if he's at school or something) but when he's here she can't seem to control herself. I expressed my concerns to my boyfriend and he seems to think it's part of her curiosity and sees it as a stage. I'm really uneasy at how graphic the actions she's doing her. Any advice is appreciated!