73 / 76 by jennifer christensen when my son was in third grade, we were driving to walmart and he was telling me about a book he had read called 8000 ?ings you should know . he had read the book cover to cover and learned some pretty interesting facts that he enjoyed sharing with me. i, however, was not prepared for one of them. ?mom, i know how the reproductive system works.? what in the holy hell? i was gearing myself up for this conversation that i assumed would be coming in a few years. not on a saturday trip to walmart! ?um. you do?? i tried to sound nonchalant. i?m pretty sure i sounded like elmo. ?yes,? he replied. ?