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The Pill is thought to disrupt an instinctive mechanism that brings together people with complementary genes and immune systems. Such a couple, by passing on a wide-ranging set of immune system genes, increase their chances of having a healthy child that is not vulnerable to infection.
They said that this might not only impact on fertility and miscarriage risk, but could even contribute to the end of relationships as women who stop or start taking the Pill no longer find their partner...
Craig Roberts, who led the study, said: “The results showed that the preferences of women who began using the Pill shifted towards men with genetically similar odours. Not only could MHC-similarity in couples lead to fertility problems, but it could ultimately lead to the breakdown of relationships when women stop using the Pill, as odour perception plays a significant role in maintaining attraction to partners.”
The research also found differences between women in relationships, who tended to prefer odours of men with different MHC genes, and single women, who tended to prefer the smell of MHC-similar men.
The research backs up an earlier study of how women’s perceptions of partners can alter when taking the Pill. Psychologists from St Andrews and Stirling universities found that women on the Pill tend to prefer macho types with strong jaw lines and prominent cheekbones.
However, women who are not taking that form of contraception seem to be more likely to go for more sensitive types of men without traditionally masculine features.
It is pretty ignorant for a woman to depend on a man's 95% success rate of a condom (which can slip/tear/break which can have disastrous results).
If a woman isn't on Birth control, she wants to have a kid... period...