Flirt With Each Other

Even if you've been together for years, experts say flirting sends natural amphetamines and endorphins surging through the body, stimulating an instant emotional "high" not unlike orgasm. Pretend you've just met him (or her) and act as you did at the beginning. Dress sexily, look your partner straight in the eye when he talks to you, and be aware of your body when you move in front of him.