From John Cook
I was interested in your article on sperm motility and contraction waves in the uterus and Fallopian tubes (New Scientist, Science, 24/31 December).
But in the final paragraph it states: “Women with abnormal waves have their best chance of conceiving around the time of ovulation because this is when the waves are most likely to move in the right direction.”
I would disagree. The reason that conception is most likely “around ovulation” is because this is the only time there is an ovum available for fertilisation.
