SHAPE, a woman’s fitness magazine started in 1981, interviews Mark P. Trolice, M.D., for his answers on if sex positions to get pregnant really exist.

“As an infertility specialist, I can tell you with unequivocal certainty that pregnancy occurs when sperm enters the female reproductive tract through the vagina. That’s it,” says Dr. Trolice.  “They’re all the same! The goal is sperm in the vagina.”

Dr. Trolice busts the “sex position” myth, but the article gives insights on other techniques that could aid in conception.