“J&J” is named for its two stars — Julia Roca and Juan Lucho — and is something of a lusty love story. And just as a romantic couple is composed to two separate individuals, “J&J” consists of two contrasting elements. Much of the film takes place during the day, in a white room with white shades that diffuse the abundant natural light. The lovers are both clad in white underwear, and they kiss with passion, desire, romance, and bit of pleasing playfulness. It is in this daytime space that Lucho eventually goes down on Roca, and his agile and insistent tongue soon has her moaning with pleasure and absolutely beaming with love and affection for her partner. But the couple are also presented in a far different setting. Here it is obviously late at night. Dance music throbs from somewhere else in the building — perhaps they’ve wandered upstairs or backstage in a nightclub. In this unlikely spot they kiss and fondle each other, but the mood is entirely different. No less loving, no less passionate, but more raw, more edgy. And “J&J” moves between the two spaces as Julia and Juan move through an extended session of lovemaking. In the nighttime space Julia ravenously sucks and vigorously strokes Juan’s cock. In the daytime space the tempo and intensity of Roca’s blowjob is subtly altered — it’s every bit as hot, just absent the mood and attitude of the nocturnal encounter. That daytime blowjob is followed by fucking, first in the cowgirl position, then its reverse. And through it all, even as her arousal increases, Julia is radiant, spontaneous, naturally expressive, and fully caught up in the romance and passion of the moment until orgasm overwhelms her. The scene then changes once more, and in that shadowy room the fucking continues until Lucho erupts deep inside his lover. “J&J” offers a multidimensional portrait of a couple very much in love (and lust).