Mattie (Greta Gerwig) is sitting atop James (Joe Swanberg). They help undress each other until they are both totally naked. They are seen mostly from the side. We see his semi-erect penis a few times but very briefly. We also see her natural breasts/nipples for the majority of the scene. As they fail to have intercourse, she moves to dress herself. We see a glimpse of the top of her pubic hair.
In another scene, Maggie (Greta Gerwig) and James (Joe Swanberg) sitting on the floor near a utility sink. She removes all of her clothes which expose her buttocks. She helps James remove his pants which expose his flaccid penis, pubic hair, and scrotum. As she removes his pants, she falls backwards which briefly exposes her natural breasts. Her vulva is never shown in the movie.
Quite a few sexual encounters, usually breasts are seen and the man is fully nude. One graphic sex scene shows a man fully erect as he is straddled by a woman.
Breasts, buttocks and male genitals (erect).