In one scene, Max (Brie Larson) is seen braless while wearing a white tank top. The outline of her nipples is seen very clearly (extreme nipple pokies). This scene is the closest thing to female nudity in this movie.
Occasional references
At the pool, Alicia (Anna Kendrick) strips down to her bra and panties as she steps into the pool. Tango (Chris Messina) removes all his clothes and jumps in the pool, revealing full frontal nudity. His penis is seen clearly. Alicia swims to him and climbs onto him. She wraps her legs around him. Only his buttocks are seen at this time.