11 yo sexual curiosity

My 11yo son had a close friend of his over for a sleepover (same age 11 yo). They have been friends for about two years. While I don't know all details yet, my wife woke me up frantic to say she walked downstairs and found my son naked and his friend was hiding in the closet. We do not know if he was naked also. Our son (who was embarrased) started to mention the other boy and abruptly "cut off" conversation. He claims the other boy still had on boxers, but was very evasive about it. Just said it was very hot downstairs. Obviously we feel there was sexual curiosity going on, but to what extent we do not know. As the male I want to speak with my son but don't want to shame or embarrass him. Just want a dialog. I've read it's normal to be curious at this age. Both are pre-pubescent. Is this normal or cause for concern. How do I approach him?

[blondie72]

Just approach him in a VERY calm fashion - I'll tell you it probably is normal but does need to be addressed.  Don't make him feel shameful in ANY way just calmly ask what he was doing and wait for an answer and go from there.  Good Luck to you.   You may be surprised at how naturally the conversation will come to you.   If you have not had the "talk" now is the time.