I've seen the "sexy genie" plot found in The Pleasure Slave by Gena Showalter done so many times in the paranormal romance genre that nothing in this book was fresh... except the whole alien aspect. The set-up of these plots are usually that, the heroine finds some small object (like a jewelery box or book) and unintentionally unleashes some flavor of supernatural male into her life. The male is typically tied somehow to the heroine and they have a certain timeline they need to break his curse in or he goes back in the book...or jewelery box.
Honestly, after reading so many great versions of this trope (like Fantasy Lover by Sherrilyn Kenyon and Tiger Eye by Marjorie M. Liu) I could not get into this one. I hated the over-bearing hero and the ending really pissed me off. The heroine went all Bella Swan with the mentality of, "If I can't have my man then there's no point in living!" and decided that she can't function as a human without her guy. I'm all for letting a heroine mope over lost love, but I get really irked when they seem to be near suicidal. If you're looking for the "sexy genie" plot, I would recommend picking-up Fantasy Lover or Tiger Eye, rather than this.