Characters
I need a father who's a role model, not some horny geek-boy who's gonna spray his shorts whenever I bring a girlfriend home from school.
— Jane Burnham · American Beauty

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker demands a father who sets an example and condemns sexual interest in girlfriends brought home from school. The crude description intensifies the embarrassment and anger. At its centre is a complaint that a parent’s behaviour falls far short of the role they should fulfil.
Context reviewed