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it hasn't been proven yet that homosexuality is inherited; i'm guessing that there are different patterns of causation and different degrees of heritability. but i also think men are hard-wired to get attracted to and desire many women (i.e., not just their wives). the really tricky one in terms of sin is sociopathy/psychopathy, which has a high degree of heritability. these people essentially have no conscience and no ability to empathize with other people, and they commit lots of crimes.
the issue of heritability, choice, morals, sin, and responsibility is very complex, and i will never figure it out. i think some people have more free-will than others. some people have more factors against them from birth--i would guess that God would judge the sin relative to the person's degree of free-will. but in the end, we each have to focus on our own choices and try to do what is right, rather than taking on God's role and spending our time judging others. Jesus said something about seeing the speck in another person's eye and not seeing the beam/board in our own, and also said "let he who hath not sinned throw the first stone", so as i grow older, i realize i should get my own life in order first.