Perth adults are going to be first in the world to ride the sex train when it debuts in the West Australian city at the four day Club X Sexpo on Thursday.

According to the organizers of the train named "Sexpo," the riders in mini carriages will zip past computer-operated dummies simulating sex scenes.

The two-minute ride will be reenactment of the infamous 1993 Bobbit attack, in which American woman Lorena Bobbitt cut off part of her husband John's penis.

Sexpo is expecting a record crowd of more than 35,000 in Perth.