In one scene, Aaron tells Sara that after killing his targets, he used to sleep with his victims in the grave without wearing anything

Aaron tells Sara that he has never had sex.

Full frontal nudity for an extended time of Aaron(Mark Duplass) and then Sara'a (Desiree Akhavan) breasts are shown when Aaron tells that the clothes are just the border between two humans

Sara gives a bath to Aaron. Aaron was nude (nothing shown) and clothes of sara becomes wet

While wearing her boots, we can see inside legs of Sara. i.e. Her very thin underwear. No Nudity.

full frontal male nudity. this section should be severe

No sex scenes, but nudity.

A man slices another man's throat quickly, with a splash of blood on the wall seen throughout the scene

26 instances of "Fuck", 12 uses of "Shit", a few of "Damn"/Goddamn.