Reinacting Roman chariot racing with human beings for sexual gratification.
The male must be naked wearing only a set of custom made 'Man-reigns'. He then crawls around on all fours, controlled by his female partner just as she would for a horse. Whips may also be used at the female's discretion.
"Chris is busy upstairs charioting."
"Chris likes to be dominated, he loves a bit of charioting."