I personally think the terms "gay", "straight" and "bisexual" are inherently narrowminded. It's like saying there's black, white and only one shade of grey. They are a convenient way of referring to someone that sleeps with either sex or both but problems arise when their preferences change and I think people are too quick to assume homosexuality is purely the result of disposition or purely a choice.
I think it's likely that people close to the middle of the heterosexual/homosexual "scale" (if I may) might be affected in such a way that their preference changes. What disturbs me a great deal more is the idea that homosexuals, faced with the difficulties of gaining acceptance in the community might have retreated into denial. I don't know if that's possible; I really hope not.
