Fine.
Then, do you reject the heterosexual man who may have had a fling or two but has been celibate for a few years as well as the homosexual who has been celibate?
Ratcheting your logic up a bit further, how do you determine, if both men are celibate, who is homosexual and who is heterosexual? Show them dirty videos and see who gets aroused, as RobbyS suggested?
The good cardinal spoke off the cuff. He is, after all a canon lawyer and is not a theologian.