Al's father left when Al was young without any explanation, so the son imagined all kinds of possible reasons. It turns out the father was gay, & when Al ran into him accidentally one day he learned that his father was dying of AIDS.
There is something that draws certain people to a homosexual lifestyle, and without Christ it is impossible for them to overcome it. That doesn't mean it isn't sin, but everyone without Christ is a slave to sin. This is one sin that not everyone struggles with, but those who do often cannot get away from it, even if they try. Christ has to change them first.