Christine Northrup, an OB-GYN and author of “Women’s Bodies, Women’s Wisdom” explains in the film that orgasms during labor are the results of chemistry and anatomy: “When the baby’s coming down the birth canal, remember, it’s going through the exact same positions as something going in, the penis going into the vagina, to cause an orgasm. And labor itself is associated with a huge hormonal change in the body, way more prolactin, way more oxytocin, way more beta-endorphins — these are the molecules of ecstasy.”