This is the first time I have posted on here but I don't know what else to do. TI have 3 boys aged 6, 8 and 13. The 6 year old said to me today, "mummy, the boys are snogging and having sex again upstairs" I went up to my 13 year olds bedroom and he was lying naked, face down on top of his brother who was also naked. He jumped off him. I demanded to know what was going on and he started trying to say they were playing a game but he really didn,t know what to say. When they got dressed I asked my 8 year old to tell me the truth and he said that the 13 year old had said "lets see who is the best kisser" and had made him kiss him, with tongues. He said he hated it. I asked why they had no clothes on and he said that the 13 year old had made him take them off/ taken them off him and had got on his back and was going up and down. He didnt have an erection or anything. He didnt touch him. The youngest 2 have gone to their dads now and the 13 year old is upstairs. I cant bring myself to even look at him at the moment. This was only an hour ago. Do you think this is just exploration or what? It is unacceptable either way. Who should I talk to about this? Could this be the start of something horrible? He has never had any girlfriends and is very immature for his age and he also has mild adhd. He has been constantly mentioning girls and sex lately, trying to see what I say I think. Help.