This  is the first book of The Scarlet Erotique Series by Author Sai Marie Johnson:
Camille de Clervaux has married a man with everything she needs for a life of luxury; Julien von Beirutt, but soon she begins to notice a trend in his business excursions that keep her lonely, bored, and unsatisified. Suddenly a realization dawns on her when she catches her husband in a very compromising position with another powerful man, Andre` DuPointe. Will this new added lover be the missing ingredient to spice up Cami's otherwise vanilla lifestlye?