A bad pulled-quote for a modern erotic thriller is “impenetrable,” but it’s an apt description of the film and the marriage at the center of Adrian Lyne’s Deep Water (C-). This tepid slow-burn examines the loveless union of a hangdog husband Ben Affleck seemingly nonplussed by the multiple affairs being enjoyed by his sexy but mostly sloshed wife played by Ana de Armas. The oddly non-specific Louisiana atmosphere, an adrift supporting cast including a perplexed looking Tracy Letts and a few hook-ups depicted mostly off-screen do very little to amp up the sultriness or suspense.  Close-ups of snails don’t help either. The mystery is sometimes alluring except it doesn’t go anywhere. The two leads have very little to do except stare at each other in disbelief. A series of crimes don’t make sense. The closing credits don’t make sense. Ultimately it’s a tease but not the guilty pleasure it could have been.