If being homosexual was as nature as the HRC claims then, why are all human born with all the equipment to have a heterosexual relationship?
I've always wondered if it's both nature AND nurture. Some children grow up in horrible situations, yet have just the right combination of inner strengths which allow them to come out of it unscathed. Others grow up in what for all purposes are good, healthy situations yet for some reason wind up on the wrong side; perhaps there was something known only to them that pushed them, due to a specific weakness (nature) which their environment (nurture) couldn't overcome?
So it may be with homosexuals. There may have been some sexual experience way back in their past which pushed them the wrong way, and given their tendencies, it became an irreversible (maybe, who knows) path.
Scientists have shown that neural pathways in the brain, once established, are extremely hard to change. And certain ones are much harder to change than others. Talk to someone who has tried to quit smoking. Sexual tendencies in the brain pathways, once established, are of the same concept.