This finding is going to present a problem for the "Gay-is-a-choice" crowd.
Until some evidence is presented that the mechanisms for sexual preference are matched in these flies and in humans, I don't see how it presents a problem for anyone.
And as far as the gay-is-sin crowd are concerned, does it make a difference? Temptation is to be resisted, the presence or otherwise of that temptatation is irrelevant.