The erotica is probably best explained, however, along with Nepal's ubiquitous Shiva lingams (phalluses) and the female yoni symbols, as an expression of the creative energy in male-female relations and the pleasure principles of Tantrism.
Tantrism has several pleasure principles.
Shiva's lingams are feminine.
The dog is sliding down a slide on the obstacle course.
a woman is panting a wall
The man is dressed as a doctor.
The museum displays a film depicting an heroic action.
Bikers participate in a bbq.
The set has no curtain and contrasts with the costumes.