But since atheists don't admit of any transcendental morality or decency for humanity, that is an inconsistency in their setting limits to sex.
No idea what a 'transcendental morality' is.
But morality is a social construct and has evolved over time. It continues to evolve. It is certainly better today then it was when Jesus would have been alive.
Anyone so limited that they can only spell a word one way is severely handicapped!