With the fact that Dumbledore's homosexuality is finally known, there could be bit of hints in the series that may have implied it such as these:
1) No mention of his love interest
2) "flamboyantly cut, plum velvet suit" in a flashback scene in HBP
3) His reaction when Harry told him that he said to Scrimgeor that he is Dumbledore's man " through and through "
If there's anymore hints you can find please post them.
LordJaric
I really don't give a rats ass if he was gay or not.