my ds is 3 1/2 goes to nursery and a week ago said we play sexy game I was shocked, when I questioned him he said we kiss each other and go to sleep I left it at that with him (didnt make a big thing) but informed the nursery asking them to keep an eye on them. But today he came out with we kiss our girlfriends like this he only knew girlfriends as friends now he knows them in another way and also the word sexy which I think is too early for him to start learning. should I just let it be and hope he get over it and forget about it or should I say something to the nursery again.