How about three girl athletes who want to tie up three boy athletes, and vice versa - the two groups compete against each other? Victor does what they like to the loser (well, within reason anyway, if you get my drift) for a pre-agreed period of time. Even odds and more pleasing to the die-hard heteros out there.

Dare to be different... and make a difference.
To boldly go where no one in their right mind has gone before...