The other problem with titles for me, is that I really like them to have some deeper resonance with the story.
Pure Folly - The two men spend the night in a haunted folly, and engage in homosexual behaviour, which is downright dangerous giving the historical setting.
Passion of Isis - I'll admit, very few people seem to get the title for this one. Simply, Adie spends the whole book chasing around looking for Osiris's missing cock.
Phantasmagoria - I'm not going to dissect that one. I'm just going to link it to Bev QB's review, which explains it perfectly.
The best times title wise, are when I have a title right at the outset and can then write the book to fit. Darleston's book, which I'm writing at the moment is a fine example of one of those. What's it called? I'm not ready to share yet. :)