"Beyond what is appropriate" maybe... But that doesn't mean it doesn't happen ALL of the time and don't let that teacher make you feel as if your daughter is "different" or "bad". Does it need to be addressed strongly by you? Absolutely. But go into that knowing your daughter is a normal little girl. I worked at a church affiliated day care for quite some time. I always worked with the younger age group, and I cannot tell you how many times we had to separate little ones (ages 3-6) who had hidden themselves to play "doctor". Again, it is not a good thing and by no means do I think you should just let it go, I just wanted to let you know that it is normal behavior - just normal behavior that needs to be corrected. That said I do have an almost 5-year-old girl and we have not encountered this issue. However, I would talk bluntly about it, if it did occur. My daughter, at 4, already knows the proper names of male and female anatomy. She has seen each in the book I bought especially for that purpose. And when she thinks of a question about it, she knows she can ask me and/or her father and we will explain the answer. We've never told her "no" or "not now". Some people think that is too much info for a little one, but to be honest her thought-up questions are not very detailed so in the end she still does not know "too much", but she knows everything she wants to. And, because of that, there is no reason for her to go explore it on her own. We give her the info, so she doesn't have to seek it out. I don't think it would be too late to start that sort of communication with your daughter, if you are interested. It is not for everybody, but I think we (my daughter and I) are well on our way to an open line of communication for those tricky subjects that come later. Hopefully this openness will continue. I can only hope and facilitate it the best I can. So back to your daughter. Here's my opinion: Let her know what she did is wrong. Let her know that now that you've told her it's wrong, another encounter will have serious consequences. Then move on why she did it. Answer her questions and then give her any info she might want. Try not to be embarrassed, if you are she will follow your lead and likely shut down. Also, on the ugly side of things, you need to know if this boy pressured her into doing these things and then, obviously, that should be dealt with accordingly. Good luck to you.