I gotta agree with the general feelings on here of ' don't trade or barter sex / emotions' The problem As I see it is then everything becomes about value. I negotiate contracts as part of my job, the thought of trying to negotiate things within the relationship would be unbareable to me.
What is the inflationary factor to a BJ, are there discount terms for early delivery? If washing the car in the summer is worth sleeping together, then in the winter when it is colder should be worth something more.. see where I'm going.
The other problem as I see it is then every action is assumed to be a ploy for sex/intimacy. Did you really want to do the dishes or was that a setup for a return favor.
