None.
But how moral is it when a corrupt government is putting a gun in your face and forcing you to be "moral" along their guidelines?
If all government disappeared tomorrow... How would you live your life? Would you suddenly go out and start raping, stealing, and doing every drug available? Or would you continue to live as you have, with maybe some additional resources given to protecting yourself against predators?
Sadly, many would. Which is why Conservatives aren't anarchists (unlike how the left likes to paint us). There has to be some level of societal order or there won't be a society.
If your neighbors decided to prance around naked in their yards and engage in sex on their front lawn in full view of you and everyone else in the neighborhood, what right do you have to forbid them from doing something they want to do? How does two people having sex on private property harm you? Don't give me the morality argument, after all, according to you, it's a private affair and none of you or the government's business.