According to Sexual Health Resource, "The man-on-top sex positions are very good for couples who are trying to have a baby, because penetration can be very deep. If the woman holds on to her legs behind her knees and draws her thighs right back, sperm can be deposited deep in the vagina—at the neck of the womb. This provided the best chance of conception occurring." Francoeur states that "male-above sex promotes fertility by keeping the opening of the vagina higher than the seminal pool, which, in turn, helps sperm get into the womb and find the egg." However, according to BabyCenter, "There is no evidence that any particular sexual position is more likely to lead to conception." Donnica Moore agrees, stating that while there are no scientific studies regarding the best sexual positions for reproduction, the missionary (man on top) position is typically considered optimal for conception.