It's Raining Men: Slacker Demons Book One by Jennifer Stevenson
Chloe's been dumped by yet another loser so she turns to sympathetic bartender Archie, who suddenly claims that it's the fault of terrible sex demons (including himself) and she's been selected to receive a rain of good men as part of victim's compensation. Wacky hijinks ensue.
The demon-lover trope of paranormal romance is usually a big yawn for me because they usually pair it with a "he wants to be better for her" style plotline that takes itself entirely too seriously, but this book is silly and flippant enough about it to be fun. I don't know that I'll bother with any more of the series, but this was a fun summer read on its own.
I received this one free from Librarything in exchange for fair review.