Lay the Favorite (2012) on Netflix

Beth, who lap dances to make ends meet, leaves Florida for Las Vegas hoping to be a cocktail waitress. She meets two women who introduce her to Dink, a gambler with a system. He hires her - she's good with numbers - and she promptly falls for him, even though he's married to a woman who seems to do nothing but spend his money. Beth tries to entice Dink whose wife, Tulip, tells him to choose; he does and promptly goes on a losing streak. The repercussions of his choice play out with a heavy gambler who has a parole officer, a cheesy bookmaker in Curaçao, Beth's desire to keep a friend out of prison, and help from an unlikely source.