"Think about your own history. Your life as an egg actually started in your mother’s developing ovary, before she was born; you were wrapped in your mother’s fetal body as it developed within your grandmother.
After the two of you left Grandma’s womb, you enjoyed the protection of your mother’s prepubescent ovary. Then, sometime between 12 and 50 years after the two of you left your grandmother, you burst forth and were sucked by her fimbriae into the fallopian tube. You glided along the oviduct, surviving happily on the stored nutrients and genetic messages that Mom packed for you.
Then, at some point, your father spent a few minutes close by, but then left. A little while later, you encountered some very odd tiny cells that he had shed. They did not merge with you, or give you any cell membranes or nutrients — just an infinitesimally small packet of DNA, less than one-millionth of your mass.
Over the next nine months, you stole minerals from your mother’s bones and oxygen from her blood, and you received all your nutrition, energy and immune protection from her. By the time you were born your mother had contributed six to eight pounds of your weight. Then as a parting gift, she swathed you in billions of bacteria from her birth canal and groin that continue to protect your skin, digestive system and general health. In contrast, your father’s 3.3 picograms of DNA comes out to less than one pound of male contribution since the beginning of Homo sapiens 107 billion babies ago.”