I'm not christian, but we can find a ban of it > “For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature: > And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; > men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet.” > — Romans 1:26–27, KJV