Forbidden or for bedding?

the long version

"Alexa Harcourt only ever spends one night, perhaps two, with Guy de Rochemont--never more. On her arrival at his Italian villa or his Monaco mansion, designer dresses and diamonds await her. But Alexa knows she can never be anything more than the de Rochemont Mistress. Guy's name is a byword for wealth and power--and now his duty is to wed. Virgin heiresses covet pride of place in his marital bed. But Alexa--the one woman Guy wants--is also the one woman whose reputation forbids him to take her as his wife"--P. 4 of cover.