At what age did you learn about sex and who told you about it?

Also, how old do you want YOUR kids to be before you tell them about it??
Update: Oh yeah and if I can't tell by the picture please state if you are male or female.
Update 2: Oh Meth Lab, I'm so sorry :(
Update 3: Liz_B and Melody my mother never explained it to me either
Update 4: In case you want to know, at age 13 my older sister told me that that's where babies "come from", and then when I was 15 I learned how it works. My parents never bothered to tell me.
Update 5: I'm thinking of telling my kid about sex when they get to middle school...
Update 6: middle school too late?
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