Obviously none. There is only one justification for homosexual acts (if you want to call it justification) - sodomy, whether oral or anal, or other masturbatory methods, provide a method for achieving sexual climax.
That's it! Nothing, nada, nie, nyet, zero, zilch, nothing else.
The entire "gay lifestyle", "queer theory and studies" on and on ad nauseum is SOLELY about weird ways to achieve orgasm.
Do we REALLY want to destroy society a tiny percentage of people who want to gratify their sexual organs in a weird way can try to feel normal about it?
Yes, and divorcing the universal desire to achieve said climax, from the REASON humans are born with that universal desire in the first place, leads to... extinction. No thanks!