Nope. Not a rejected headline from The Onion. This is a real offer.
After the Bishop of Getafe "demanded" that he undergo psychiatric therapy to 'cure' his homosexuality, Spanish priest, Andrés García Torres, proposed an alternative way to prove that he and his topless Cuban seminarian pal (see above) are straight as arrows:
"Let them measure my anus and see if it is dilated."
While I can't be sure that measuring someone's anus can prove whether or not that person is gay, if Garcia's secondary plan was to make the Bishop of Getafe feel pretty uncomfortable — and plant images of measuring gay anuses (gaynuses?) in our heads— he definitely succeeded in doing at least one of those things.