It could be a recessive gene.
A recessive gene is a gene whose effects are masked in the presence of a dominant gene.
This study found this:
***According to Ganna, these genetic variances have “a very small effect” on sexual behavior, and combined, only explain “considerably less than 1% of the variance in the self-reported same-sex sexual behavior.” This means that non-genetic factors, including environment, upbringing, personality, and nurture “are far more significant in influencing a person’s choice of sexual partner, just as with most other personality, behavioral and physical human traits,” according to the researchers.***
So this isn’t a recessive gene. If it were dominant or recessive, researchers should be able to predict whether a person would be gay or not if same sex attraction was genetically determined, but they can’t. These 5 markers are there but they don’t determine your sexuality. That’s what nurture explains, not recessiveness.
A recessive gene if not replicated does not stay in the gene pool.