It is objective. If morality is relative, then the most heinous acts can be justified by the weakest excuses. When an individual decides to take the life of another for no reason other than it suits his caprice or his hatred, we rightly condemn the killer. Morality as it applies to murder and rape is easy to define. But to discuss the very concept of sexual morality will find both parties arguing in a pit of politically correct quicksand before clear points are even made.
Sexual morality is based on a belief that all human life is sacred.
It is a natural extension of basic morality. The life of a homosexual is as sacred as the life of a heterosexual. Crimes that target homosexuals are equally as wrong as those that target any individual. Homosexuals are human beings and not a species apart to be demonized. For the record, it opposes the practice of homosexual sex, much as it opposes the practice of pre-marital sex.