Saw 5 year old kissing another boy

I recently caught my 5 year old son and his 4 1/2yr old boy playmate on top of him kissing with their shirts up.  They seemed too comfortable doing this, like they had done it before. When I told them to stop, the friend said, he started it, refereeing to my son. I found this very disturbing as my son has never displayed this type of behavior before.  Can this be a sign that someone has showed him how to do this? Or a sign of abuse from someone?  He has never caught me and my husband and never exposed to any kind of sexual intimacy in the home.  I'm really concerned about this as he has spent time in this little boy’s home without me. Should I confront his parents about this? Don't know what to do and extremely upset about this.  Please help.

[specialmom]

Maybe this is something he has seen on tv?  I think I'd talk to him about what is okay and what is not.  Boys of this age do like to hold hands and hug each other with no worries.  You can talk about it with your son who is 5 and tell him that it is okay to kiss some people (maybe go through a photo album and point out family---  you, dad, grandma, etc.) that are on the kiss list.  If they aren't on the list-----  we don't kiss.  I'd suspect that he has seen this somewhere.  I wouldn't leave him unsupervised with the other child either.  You could mention it to the other boys mom but I wouldn't go crazy and make it a huge deal.  While I wouldn't want to see my son doing this----  It wasn't a big sexual situation either.  If the problem persists  or worsens then I think a professional getting involved to make sure nothing has happened to him would be wise. But as I said, I suspect he has seen this somewhere and is acting it out.  (or the other boy is not telling the truth and HE has seen it and acted it out with your son.----  either way, message the same for  your boy.  No kissing on playdates!)  Good luck.  Kids end up doing the craziest things.

[jdwil0814]

Thank you for your reply.  I'm just so sick about this and hope he hasn't been abused in anyway.  Not sure where he could have seen this before.  My television is always on   children programs.  Also, my son was erect after I told them to stop.  I will keep an eye out for any unusual behavior.  Again thanks for you reply.