Child playing sexually with cousin
	
	
		Hello -   
This question is hard for me to ask because it really breaks my heart.  My son just turned 6 and he has a 4 year old boy cousin and every time they see each other they touch each others privates.  We can't even allow them to play alone for fear that they will do it again.  Most recently was today, which was the worst so far.  My nephew came over to play with my son and they were watching TV.  I went in to check on them and to put this nicely they were licking each others privates.  Of course I immediately stopped them and began to cry.  I have never had to deal with an issue like this before.  My son has never done this with another child, boy or girl and I don't think my nephew has either.  My husband and I are not sexual at all in front of our son other then small kisses to show affection.  My nephew's mother (my sister) has recently become a lesbian and I wonder if he may be seeing things he shouldn't and getting my son to go along with it.  Does anyone have any advice on what I should do?  I know that exploration at their age is normal, but I really don't think it's normal going as far as they have.