Your account on RateMyServer says you offer them, and yet I am pretty sure that the NPC will only marry a man and a woman, so how would a homosexual couple go about getting married?
Same-sex marriage is enabled on heRO. One of the person from the homosexual couple have to register as "the bride" and the other as "the groom", but both will get the proper wedding ring and wedding works fine, just make sure you have the money.
I don't see why you would assume that it does not work