I sort of think it is something that some lads do with their Dads, testing their strength etc.
But DS loves wrestling with me. It gets very full on although I am careful not to hurt him too much. Although to be honest, he seems to enjoy it if I match him and there is a chance I might inflict 'minor' pain . I stopped him yesterday and he was begging me to carry on, laughing like crazy, poking me and provoking me to carry on.
I have talked to him about not actually hurting me (he is 12), but he is like an over energetic andrex puppy and part of me likes the fact that we are connecting on his level.
It does make me laugh, it just feels weird as I had always thought it was a Dad/son thing.