Sex pillows, chaises and position aids have so much more to offer than lower-back support. By playing with shapes, texture, and technology, you get more, um, bang for your buck. The main thing it changes is the way positions feel. Doggy style will have a deeper penetration. Missionary will be a little less bland when you feel your G-spot or P-spot being hit. Oral will be effortless without neck pains when your partner's body is raised up and at a perfect level for you to work your magic.