Two examples of standard rewards:
(1) If a
guy allows a visiting gal to use his shower, she lets him accompany her into the shower and dreamily canoodle with her under the warm waterfall.
(2) If a misty-eyed
guy wants to give a buxom gal a naked chest-to-chest hug, he'll soothingly massage her back all during said extended deeply-squeezy snuggle-session. (A variation on this "contract" would be that if she lets him savoringly play with her boobs and fondle her
butt, he'll massage
whatever other body-parts that she requests him to soothe --- i.e., her
feet, shoulder-blades, neck, etc. --- for a similar length of time as he pleasures his thirsting hands with her "choicest morsels".)