None of us particularly enjoy the situation, but we do have solutions. The vagina. This exquisite domain of women is a revered source of mystery and power. It's also a part of our bodies like any other, subject to the wear of time and experiences.

Our culture tells us a very powerful story: that sexual desire in long-term relationships is certain to vanish.  This narrative leaves us with a heavy expectation of less frequent sex and diminished hunger for our mate.

Arguably, the vagina -accompanied by labia, vulva and clitoris- is the most culturally fascinating part of the human body. Objectified in mythic proportion, a focus of obsession and fear and desire, this deeply contemplated body part is little discussed in terms of its intriguing physiology. 

Anais Nin is, of course, among our most beloved thinkers on the cause of women and eroticism.  In her Delta of Venus, a collector of pornographic writing hires struggling writers to pen short story porn according to his specifications. He refuses to pay for anything other than...