A report on the Mail and Mail on Sunday website has the following report;
Genetics, along with hormones and upbringing, may play a part in sexuality, according to a study.
Researchers claim it is known that there are well-established traits which differ between girls and boys, with, for example, boys more likely to engage in ‘rough and tumble’ play.
Children who later become gay or lesbian are more likely to differ from these expected traits, or gender conformity, said a team from Queen Mary University in London.
Between 50 to 80 per cent of gender non-conforming boys become gay, and around a third of non-conforming girls become lesbian.
Now, doctors Andrea Burri and Qazi Rahman believe that in girls, genes may be partially responsible for gender non-conformity and, by association, sexual orientation.
They followed a group of 4000 female twins, asking them about their sexual attractions and gender non-conformity.
They discovered genetic influences on sexual orientation (25 per cent) and childhood gender nonconformity (31 per cent), reports journal PLoS One.