Every night, roughly around 10 or 10:30pm, Asher and Marley perform this little homoerotic kabuki battle scene for about 10 minutes. Asher's always on top, because Marley lets him. Sometimes Marley looks up at us from his place on the floor and kind of winks at us: "Man, this old cat is weird, but I'm letting him have his way."
Bear in mind that these are both neutered males, and Asher (the white one) is 14.5 years old. (Perhaps, "I can haz frottage?")
Here we have the initial chase scene turn into a yin-yang of biting cats [sorry about the bad cameraphone photos, but it was all I had on hand):
Asher's got Marley in his ritualistic dominant pin-down:
and finally, Marley waves from underneath Asher and makes the "crazy" sign next to his head with his paw: