Back in 1959, there was a movie entitled "Battle of the Sexes". No, that is not where this class came from, but, depending on how you and your partner get along, you might well want to see the film before entering. It started out as an unlimited class, but was reduced to two persons in 2002.
There shall be no specification as to the type of craft used except that such craft may be propelled only by human muscle power and limited to two entrants, one male and one female. (To win the class, both participants much finish.)