DD 4: "So if I have your blood in me and daddy's blood in me, how did I get daddy's blood? I grew inside you..."

Me: "Well... it takes a man and a woman to make a baby. (Long pause.) The woman has the egg, which becomes an embryo only with fertilizer from the man." DD knows about eggs and embryos. More questions.

Me: (Total cop out) "Usually the man and the woman kiss and wrestle in bed and fertilization happens."

A lot more questions so I change the subject.

Can I just tell her? lol