i think it's must be a tradition to say that a crown prince is gay..it's must bring good luck to them;-))
Exemple Philippe of Belgiumeople say that he was gay and look at him now! Married with a beautiful woman and 4 beautiful children.
So, i hope the same for Guillaume!!!
Yes but Grand Duke Constantin was gay and also happily married with NINE children!
For Guillaume, I think he's simply shy, very shy and he is careful and reserved because he knows he is considered as nice, opened but not bright. He does not want to be exposed to a humilation, or taken in defect. And in Luxembourg, they said he had girlfirends when he was student abroad.
But he seems to aspire to a quiet life surrounded with a kind little family and with his friends of childhood.
And for Theodora of Greece I think her father and the girl herself won't want the princess to convert into the roman catholicism.