I watched a history of all the us presidents like 15 years ago or so. Several of them from the 19th century were described as being 'something of a dandy', which i took to mean they were probably gay
Cheater Arthur was described that way in particular, though he was married and not a lifelong bachelor.
Buchanan was a 'confirmed bachelor' and something of a dandy too. Also he was by far the worst president did nothing to stop the civil war, not that they're related.