As mundane and “unsexy” as it may seem, many married couples would do well to plan their sex life ahead of time. The same principles on dating apply here. You are busy and involved in many other things; time slips by without even realizing it. You need to set aside time for intimacy with your spouse. If you rely exclusively on spontaneity, you might find that you are forever getting and giving mixed messages about when each of you wants to have sex.