There are numerous reports from the Cannes Film Festival of some very explicit love scenes between Adèle Exarchopoulos and Léa Seydoux in the film "Blue Is the Warmest Color (AKA La Vie D'Adele Chapitres 1 et 2)" Here is a fairly detailed description of the scene from Vulture.com:
"I clocked the first sex scene between Adèle and Emma — replete with fingering, licking, and, as a friend called it, "impressive scissoring" — at an approximate ten minutes. Audience walkouts began around minute nine. That turned into spontaneous applause (and relieved laughter), when the women climaxed and finished a minute later."
http://www.vulture.com/2013/05/ten-minute-lesbian-sex-scene-cannes.html
Here a another snippet from Film.com:
"Adele and Emma connect first and foremost on a sexual level and to understand the depth of their passion you can’t just hear them talk about it – you need to see it. Despite the tongues, heaving breasts and exposed sex organs, Exarchopoulos’ flushed cheeks that are the most erotic things on display"
http://www.film.com/movies/blue-is-the-warmest-color-review
"Blue Is the Warmest Color" has been picked up for US distribution by Sundance Selects, but there is no announced release date. According to this tweet, Seydoux also goes full-frontal in another Cannes film, "Grand Central".