While this is a hot potato, not so fast applies in pointing the finger wrongly. There is chaos and confusion when quoting the Hebrew bible in this matter. Surprisingly, the Bible is correct here. Gay is not a moral or ethical issue - it is purely an existential issue for humanity. If 20% of the pop goes gay humanity will not survive after a few generations. This factor is thus more problematic than incest, for example, and becomes a humanitarian issue resting heavily on both gay and hetros, impacting both sector's existance rights, testing both.
The other problem is there is no way gay can be sanctioned and incest not; both rely on the same criteria of acceptable mutual consent. It opens a future of someone being ex-comminicated for not attending a marraige or child birth celebration of a 50 year man and his 25 year biological daughter.
The laws must go with the majority, namely the broader community rights; the minority rights are sustained by accomodation and tolerance.