It came unexpectedly: the question that most parents try to rehearse the answer to, but inevitably mess up when reality strikes. My six-year-old turned to me out of the blue and said: "But what I don'€™t understand is how the seed from the man gets into the woman'€™s egg."My initial response was to gloss over her question. After all, at six a child shouldn'€™t know about sex, I reasoned. But she persisted, so I had little option but to dive into a quick-'€˜n-basic lesson on anatomy '€“ which both amused and fascinated her.