Yes, penal and civil code already governs behaviors. What you want is a fascist state where some minority behaviors can dictate their repugnant subculture to the majority. Gay sex does not equal race. Not literally, nor legally.
So now gays having the same rights as everyone else....
is fascism? I don't think fascism means what you think it means.
Clearly you've never heard of the 'tyranny of the majority. The majority can't vote away the rights of the minority. And often the body that protects the rights of the minorities from the tyranny of the majority is the courts.
That you feel homosexuality is 'repugnant' is completely irrelevant to their right to marry. As their rights aren't based on your feelings. Nor should they be.