Diving, tongue first, into the depths of a girl's asshole.
Being bored with normal cunnilingus, John decided to go spelunking.
When John's girlfriend recoiled in surprise, he had to stifle his laughter as he showed her how nice going spelunking could be.
Get on all fours, and have a girl lick your ass while jacking off with your hand.
I just gave a girl a Dirty_Andreas and finished with a Houdini