Taking the contraceptive pill can lead a woman to choose the “wrong” partner, the findings of a study published today suggest.
The pill is thought to disrupt an instinctive mechanism that brings people with complementary genes and immune systems together.
By passing on a wide-ranging set of immune system genes, they increase their chances of having a healthy child that is not vulnerable to infection.
Couples with different genes are also less likely to experience fertility problems or miscarriages.
Experts believe women are naturally attracted to men with immune system genes that differ their own because of their smell.