Just like your feet, your scalp is an erogenous hot zone chock full of sensory receptors that can spark either relaxation or wanton behavior when stimulated. (Both, if you’re lucky.)
Invite your partner into the tub and sit behind him or her. Begin with a tension-relieving face and scalp massage with your bare fingertips, gently pressing in circular motions along the temples, forehead and cheekbones. Then use a generous amount of shampoo to begin working into his or her hair — the more frothy lather you can work up, the more outrageously luxurious and sensual the shampooing will feel. Spend a few minutes massaging the shampoo into your partner’s hair, and then gently and slowly rinse it out with a pitcher filled with warm water — a step guaranteed to elicit goosebumps and maybe a few oohs and aahs.
Finish up with a nice head, neck and shoulder massage for extra points.