The more brothers you have, the faster your sperm swims
Published 19/12/2012 | 05:00
Men with more brothers than sisters are likely to have faster swimming sperm and greater fertility, a study suggests.
Scientists assessing the fertility of 500 men found that sperm swimming speed correlated with family make-up.
They found that men who mostly had brothers had faster sperm than those with mostly sisters. The finding was published in the 'Asian Journal of Andrology'.