Sex is legal just once a year in surprisingly lame rom-com ‘One Night Only’

Too bad the set-up is also the funniest part of “One Night Only,” starring Callum Turner and Monica Barbaro.

‘What if The Purge was for premarital sex?’ is the odd, gimmicky elevator pitch for this slickly made yet ungainly oddity that can’t quite get past the grimness of its conceit Going into a romcom, there are always the same questions. Will there be genuine chemistry? Will the rom and the com be equal in parts? And, for