Four of Hearts (Lothario Series ~ Book 4)

Marriage hasn't tamed Candace Callahan's sexual curiosity, something her husband Ryan is grateful for, but when she asks him to tie her up for her anniversary present, he knows he's going to need the help of their friends, Richard Wolfe and his wife, Fallon.

Dr. Fallon Enright is the resident sex therapist aboard the Lothario - the cruise ship co-owned by her husband and Ryan Callahan. When Ryan asks to participate in one of their couple's rope bondage classes, Richard isn't sure it's a good idea, but Fallon assures him all will be well.

What begins as innocent curiosity, blossoms into a polyamorous relationship none of them could have expected, but they are powerless to ignore. When the tabloids expose their new lifestyle, the foursome must choose between the love they feel for each other, or accepting society's moral constraints.