The road to being gay has many paths but one thing is for sure: it is a genuine state of the individual. It isn't made up or something that can be undone using experiments or drugs.
I think everyone has the homo gene in them and some people just have it "Activated" more than others for whatever reason. I am basing my theory on some animals that are born different and seem to attracted to the same sex within their species and they were not taught to be like that.
Comments: The only person to really answer this question is the person that is gay. As a homosexual I can safely tell you that I grew up in a home with both a mom and dad. They did a great job of raising me. I always, from the earliest I could remember liked being around boys more than girls and felt attracted in that way to men more than women when I got older. It was just me, I was born like this. No one taught me or forced me to be gay.