If you're both comfortable with this idea, when they come home or visit you, grab them, blindfold them and tie there hands together with a silk scarf. Make sure while you're making love that you take your time to pleasure them and show your love. Buy a few books on lovemaking or print out a few articles on lovemaking from the Internet. Leave them in places where you know you're partner will see that you're reading them. Make it clear to them you're going to try some of these tips out on them when you're ready.
Touch can be a powerful sexual arousal technique.
During the day touch your partner whenever possible. Do it as if it's something you'd do everyday. When you're sitting next to each other, place your hand on their thigh. When you're standing caress their back or stomach. Go somewhere just for the sake of making love.