Naughty Newlyweds (2006)

Frank and Diana are a young couple who just got married and are looking forward to a romantic honeymoon in Hawaii. But the newlyweds get more than they bargained for when they discover that the beach resort where they've booked their rooms is actually a retreat for traveling couples interested in swapping and sexual roleplay. Things go from bad to worse when they discover that the other two couples will be staying in their room, but what looks like a disaster turns out to be an eye-opener that opens up new sexual territory for Frank and Diana.