Full rear nudity of an older teen male in a shower is seen for a while. Men's chests are seen briefly a couple of times. An unclothed male infant is seen from the front as he is dipped into a bath during a baptism. A boy is seen for a minute or so in his underpants trying on clothes. There's no female nudity.
An older teen male survives by prostituting himself to much older men. We only see him meeting the men or exiting hotel rooms. He converses frankly with 10-year-old Mischa about this and shows the boy cell-phone pics of the sexual activity (but we don't see them, and the strongest language we hear is "tits.")
Mischa is shown covering his ears when we hear the subdued grunting of his mother and step-father having sex.
An old video of a children's TV show talks about a child being unwilling to part with his mother and attributes it to an Oedipal complex.