Estimates as to the number of gay people in the population range from 1-in to 1-in, so why are some people gay? Are they gay by choice or is being gay genetic? The simplest answer is to look at the definition of the word "gay." The term gay is a synonym for homosexual, which is defined as, 1,2 "Of, pertaining to, or exhibiting sexual desire or behavior directed toward a person or persons.
Though scientists have long suspected some sort of genetic link, Rice says studies attempting to explain why people are gay have been few and far between.
No matter why those genes are still around, we do know that being gay is partly genetic and partly determined before a baby is even born. This tells us that sexual orientation isn’t a learned behavior or a choice. Editor’s note (2/8/): This article was lightly edited for clarity.
But gaps will remain, such as why some firstborn sons are gay, why some identical twins of gay sons are straight, and why women are gay, to name just a few.