Much of the plot revolves around two characters' very tentative steps toward romance. There's a lot of sex-related conversation among these and other characters, and some groping and kissing, but no actual sex except for a few-seconds-long thrashing under the covers scene.
There is some nudity. Various women receive massages and are seen in bra and panties, butt cheeks are seen when panties are moved to the center, and a woman's breasts are seen once.
In one extended scene a conversation about penis types (growers vs. showers) leads to a man being seen first nude but with genitals hidden and then to full frontal male nudity.