My little boy likes to lay on the floor or bed with is hands down his pants and 'humps'! (Sorry as cannot think of a better way to say it) He does not do it all the time and always on his own - he might do it whilst watching telly, or just lay in bed in the morning. Yesterday when Daddy went into see him 1st thing am, he said he wanted to be on his own!!! Is this part of normal development? He is a happy, confident, social person with a full and active life. I have not said anything to him as I don't want to give him any hangups for later on and don't want to have to explain that its not acceptable as why shouldn't it be in private. Has anyone else been through this and what did you do? Ignore or talk to him, and if the latter, how did you do it, and does he still 'hump'?