How to Do It Photo illustration by Slate. Photo by Jupiterimages/Getty Images Plus.  How to Do It is Slate’s sex advice column.  Have a question?  Send it to Stoya and Rich here.  It’s anonymous! Dear How to Do It,  My wife is 70, I am 66, and we are writing with a question about women’s orgasms—particularly hers, which are intense. When we have sex, my wife typically has 10 to 15 orgasms in 15 minutes, with no decline in intensity. We are wondering if her experience can contribute to a better understanding of female sexuality. When we were first together in our late 40s, we had sex once or more every day; now we have sex once every week or two. She could actually keep going, but her clitoral sensitivity eventually makes us stop. In her 30s, she once climaxed 47 times within 30 minutes of self-stimulation. My wife tells me that the key is in her ability to focus. Our research has turned up very little that reflects her experience.…