The study shows that genes play a small and limited role in determining sexuality. Genetic heritability — all of the information stored in our genes and passed between generations — can only explain 8 to 25 percent of why people have same-sex relations, based on the study’s results.
Just a refinement of what you said. And, no the gay person doesn't decide to be gay. However, if the other 75% to 92% of why they are gay can be controlled in some way, the number of gays can be reduced, maybe. Just a thought. I have no evidence to support that. It says:
“Obviously, there are environmental causes of sexual orientation. We knew that before this study.” said Bailey, citing the well-defined role that life experiences play in sexual development. “But that doesn’t mean we know how to manipulate sexual orientation mentally.”
Will that always be true? I don't know. And this is after they are discovered to be gay. What about discovering the genes that predispose someone to be gay in the first place, and also after this knowing what environmental factors come into play with more scientific informaton being discovered about what those environmental factors are, and changing the environment somewhat.