Bon Appétit (1980)

Faith is a struggling cateress trying to support herself and her loser boyfriend, Al. At a social function she overhears a friendly wager offered by a socialite. The wager is $250,000 to whomever can have intimate sex with the world's top 10 male lovers within fifty days. Faith accepts the challenge, but discovers complications as she and her official "witness" spend such a long time traveling the globe together.