Blue Room the Film

Toño (Juan Manuel Bernal) and his wife, Ana (Elena Anaya), decide to come back to their home town, after living for a long time in Mexico City. But things get complicated when Toño finds Andrea (Patricia Llaca), a woman for whom he had lusted since adolescence, in the town.
Thus, the unfulfilled and repressed desires of both Toño and Andrea are passionately released with their sexual encounter.
Hiding from Toño's wife and Andrea's husband (played by Mario Iván Martínez), they are helped by Toño's brother (José María Yazpik), who runs a hotel in the town, and whose blue room is lent to the lovers (hence the name of the film, "The Blue Room").

 http://en.wikipedia.org/wiki/The_Blue_Room_%28film%29