Researchers believe that male homosexuality may be due to a gene carried by mothers.
Evolution suggests that homosexuality as a trait would not last long, as it discourages sex, with women and therefore procreation.
But a study by Andrea Camperio Ciani, from the University of Padova in Italy, spots a correlation between gay men and their mothers and maternal aunts, who tend to have significantly more children than the relatives of straight men.
They theorise that this leads credence to the ‘balancing selection hypothesis’, which suggest that a gene which leads to homosexuality also leads to high reproduction among their female relatives.
As such, while the ‘gay gene’ may not get passed down directly, it will survive through the generations via the family.
The gene or genes which causes this behaviour is not yet known, but the report by Ciani suggests that it resides on the X chromosone, of which men inherit one.
Originally, the team considered the hypothesis that the gene would affect men and women in different ways – making the man homosexual, and making females more promiscuous.
According to the Huffington Post, But after studying 161 females related to both homosexual and homosexual men, they now conclude that – instead of increasing the woman’s promiscuity, the gene makes the women more attractive to men.
Ciani told Life’s Little Mysteries: ‘High fecundity, that means having more babies, is not about pleasure in sex, nor is it about promiscuity.
‘The androphilic pattern that we found is about females who increase their reproductive value to attract the best males.’
He said the gene led to women who were more fertile, displayed fewer gynecological disorders, and less complications during pregnancy.
They were also inclined to be more more extrovert, happier and more relaxed.
The study will appear in a future issue of the Journal of Sexual Medicine.
h/t Rex Wockner