When twenty-eight-year-old Tracy Walker's boyfriend of three years tells her his birthday wish is for a threesome with Tracy and another woman, Tracy wishes she was about fifteen pounds trimmer. All she can think about is how her slightly overweight body would look naked next to another woman's perfect form.Eric Salazar loves his girlfriend and wishes she'd love her body as much as he does. When his birthday arrives, he gets up the nerve to ask her to join in a threesome with another woman. The idea has always turned him on, and he sees it as a chance to show Tracy once and for all that her body is the one he wants most of all, just the way it is.Tracy and Eric meet up with Barbie, a good-looking blonde who helps them have fun in ways they'd never dreamed possible. Over and over again.