In their book, The Act of Marriage After 40, the LaHaye’s share a joke: [i] The following are the three stages of a couple’s love life- Couples in their twenties have sex triweekly. Couples in their thirties try weekly to have sex. Couples in their forties, fifties, and sixties try weakly to have sexual relations. Those of you crossing the threshold into the middle-age years, don’t believe a word of what you may hear about your sex life dying. It won’t die (unless you let it), but you will have to adapt to the changes…