Must tell you this. My ds (7) came up to me the other day and asked out of the blue if I had sex with daddy more or less than 4 or 5 times a year! When I casually answered, more, he then asked how many times. I said quite a lot, and he then said, what is sex. LUCKILY, his brother came up at that point and he was distracted. However, two days ago we were playing scrabble, I went into the kitchen, and he followed a couple of minutes later. He had the letters, x, e, a. He said he had the letters 's and e' on the board and wondered what letters to use to finish the word! I said 'what about 'a' to make 'sea' and he said 'not 'x' then?' I said no, I quite liked 'a' because I liked the sea and he said 'I think I'll take x to make sex'!!!! Aaaagh! He's bound to ask what it is, what do I say? The truth? Surely not!!!!!