Series: Desire Through Time
by Author Charlotte Stein
Book
Past Pleasures (2010)
Kate is hired by a researcher to time travel, and gets sent to a future which has no women and exceptionally hot men. The world-building didn't make a whole lot of sense, but this was a lot of silly fun, if you don't think about it too much. I don't think I've ever read a menage story before, but...