Normal heterosexual men and women who are incarcerated may turn to each other for that which is deprived as a characteristic of incarceration. This includes sexual gratification and tenderness.

Also, men and women may change their sexual preference as they get older or as a consequence of moving into a different social circle.

In both cases the facts seem to indicate that sexual preference has a strong environmental component.

Have you any proof that sexual preference is "inherent and immutable"?

I can offer some personal observation: I know several men and women in my age group who believe they have always been homosexual. I also know a bunch of men and women who believe they have always been heterosexual. And I know a smaller number who shift back and forth.

I think the expression of sexual preference is far more complex than science or society can explain at this time.