This three book set features three separate menage vampire romances. Yes, menage and vampire. It's a two-fer of guilty pleasures. Each features a completely different set of heroines and lovers. It is all M/F/M with a heavy emphasis on the female being the center of all action and desire. 
 If you've never read menage, this might be a fun way to test the waters. The romances are slower to develop than traditional menage and the multiple scenes happen at the end of each, following a clearly solid primary romance. Also, they aren't sloppy and the language is less potty-mouth than many I've read.