Last week, whilst watching c-beebies with my 3 yr old Daughter, she moved onto the floor, grabbed a cushion and started moving her bottom up and down with her eyes closed. I asked her what she was doing and she said that it felt nice, "particularly at the end". Since then, she has done it sporadically, and it was embarressing when we went to visit her Grandparents last weekend and she got down on the floor and did the same thing. She has also asked me to tickle her between her legs because she likes it. I am concerned to say the least - has she just found something that tickles or could she have got this from elsewhere?