This one pretty much explains the attraction many men have regarding their wives becoming their "key holder". If the wife really enjoys tease and denial play with her husband, it creates a situation where he is kept in a constant state of sexual desire and heightened sensitivity until she chooses to allow him relief.
The wife usually finds that her husband becomes more compliant to her wishes as well, presumably to garner favor to gain relief. He will usually become more loving and doting on her desires.
Oddly enough, for those who get into long term chastity accompanied by a good amount of tease and denial play, the desire for orgasm becomes overshadowed by the desire to remain at that heightened level of sexual excitement. Having an orgasm, as wonderful as they are, becomes a love-hate thing because as much as you want to enjoy one, you know it will take so long to regain the level of constant arousal that becomes like a *******.