If you are in prison and you take it up the butt are you gay?

You are gay if you are sexually and/or romantically attracted to the same sex. That is the only way you can know.

Some writers have called what sometimes happens in prisons, the armed services and boarding schools, where males are all living together without female company, as "situational homosexuality".

In prison many men have sex with each other because they have no other choice, and they find it better than doing it alone. If you go along with this because you agree, or you feel you have little choice, it does not make you gay. If you were straight before you went into prison, you are almost definitely going to be straight when you come out.

If you are forced to "take it up the butt" and you don't agree, then you are being raped, and you should inform the prison authorities.