Sexual orientation is a matter of biology, not choice.

We believe that:

Sexuality orientation is a matter of biology, not choice.

Sexual orientation, much like handedness or tongue curling, is determined by natural biological factors such as genes or hormones.

Scientists are still searching for genetic underpinnings of sexual orientation and this will biological mechanism underlying Sexuality orientation.

In December 2017:

Source: Scientific Reports:

Groundbreaking research led by a team from Brock University has confirmed that sexual orientation for men is likely determined in the womb.

Argument: Family and twin studies suggest that genes play a role in male sexual orientation.

Professor Tony Bogaert, lead researcher on the project, said the new study has produced some of the most significant findings in men’s sexual orientation research in the past 10 or 15 years. The team included researchers from Harvard and the University of Toronto.

It helps solidify the idea that, at least in men, there’s a strong biological basis to sexual orientation.

“This is the culmination of more than 20 years of research where we started looking at the older brother, or fraternal birth order, effect. The current study adds to the growing scientific consensus that homosexuality is not a choice, but rather an innate predisposition.”

Dean Hamer at the US National Institutes of Health, who led the study that pinpointed chromosome X back in 1993. “It adds yet more evidence that sexual orientation is not a ‘lifestyle choice’. But the real significance is that it takes us one step closer to understanding the origins of one of the most fascinating and important features of human beings.”

May 2015

Psychological Medicine

Findings from family and twin studies support a genetic contribution to the development of sexual orientation in men.

the most recent study also found shared markers on chromosome 8. This latest research overcomes the problems of three prior studies which did not find the same results.

Feb 2010

Title:

Common genetic effects of gender atypical behavior in childhood and sexual orientation in adulthood: a study of Finnish twins.

Studies tell us that there are such things as “genes for sexual orientation”.

A population-based sample of 3,261 Finnish twins aged 33-43 years.

1993 Jul

A linkage between DNA markers on the X chromosome and male sexual orientation.

Three gene finding studies showed that gay brothers share genetic markers on the X chromosome;

The role of genetics in male sexual orientation was investigated by pedigree and linkage analyses on 114 families of homosexual men.

Gene finding efforts have issues, but these are technical and not catastrophic errors in the science.

Inadequate research on female sexuality. Perhaps this is due to the stereotype that female sexuality is “too complex” or that lesbians are rarer than gay men.