Worried he might be gay after seeing his father with another man, Tomás persaudes his girlfriend to have sex with him. She lays out a mattress which he lies on and then she lies on top of him.
One boy tells the other that he knows how they "operate on people in the asshole". Then he tells the other boy to lie on his belly. Then he is tickling the boy's bare buttocks with what looks like a paintbrush with no paint on it.