Kindergarten daughter saw classmate's penis

My kindergarten daughter saw a classmate's penis when he was dancing around the boys bathroom with his pants down.  The doors are always open in the bathrooms at school.  She told the teacher and then she also told me about it when she got home from school.  She doesn't seem bothered by it, but I am just curious if this could have any long-term effect on her?  She has never seen a penis before except for my friend's infant son when I change a diaper.  This boy at school is pretty well known as a troublemaker in their class also.

[Kevin Kennedy, Ph.D.]

No, there is no reason to expect any deleterious impact on her. Have you spoken with her about the physical differences between boys and girls? This could be an opportune time to do so. If you do, utilize some chuildren's literature avaliable at your local library, and keep the discussion very simple and straightforward.