The Piston and the Shaft

There's a shuttle coming into dock
 A key fitting into a lock
 That opens the gates between me and you
 And turns up the heat on the stew
 When we pass the baton tonight
 We'll wonder as we lose our grip
 As it shuttles back and forth so freely
 Which end's the base and which is the tip?
 We got a funny situation, you and me
 We're the piston and the shaft
 But who's going in and who's coming out?
 Who's drinking wine out of who's carafe?
 Chinga, chinga, change, a little change, sacrament
 Each night turn me over again
 Chinga, chinga, change, a little change, sacrament
 Each night turn me over again
 Chinga, chinga, change, a little change, sacrament
 Each night turn me over again
 Chinga, chinga, change, a little change, sacrament
 Each night turn me over again
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 When the car parks in the garage
 When the beauty receives her beau
 There's a border taut and bold
 That's a feeling we'll never know
 You're the hard spot on my seat
 I'm the drooling bitch in heat
 I'm your gravy baster gun
 You're my creamy squishy bun
 We got a funny situation, you and me
 We're the beaver and the hog
 But who's biting what and what's eating whom?
 We're a dripping marsh full of frogs
 Chinga, chinga, change, a little change, sacrament
 Each night turn me over again
 Chinga, chinga, change, a little change, sacrament
 Each night turn me over again