Erotic teasing can create heightened states of arousal and more powerful orgasms. Think about how good water tastes when you are thirsty, how satisfying food can be when you are hungry.
Couples can use teasing as an ongoing form of foreplay. Brush up against your lover in the kitchen just so, but keep on walking. Kiss your lover passionately just before leaving for work. Straddle your lover and let them feel your weight, just before hopping out of bed. By creating a simple moment of arousal and then moving on, you allow that pleasure to linger in the air, creating the excitement of possibility.
Teasing can also take more intense forms, either solo or with a partner. Many people like being brought to the edge of orgasm without immediate release. Teasing can be a way of prolonging arousal and building excitement.
One sexual teasing technique is called Edging. The Edging Technique, used mostly by men, creates more pleasure by bringing arousal to just the edge of orgasm, then backing off, then building again, and so on until orgasm is desired.
Another teasing technique is called Tease and Denial. This more extreme form of teasing is used by those who eroticize the denial of orgasm. Arousal is built up, but orgasm is never permitted, creating a long-term state of pent up arousal. Tease and denial is usually used in the context of power play, but can also be used by those who wish to cultivate sexual energy without ejaculatory release.