Even in our most exhausted moments, we always have a reserve of energy stored away. It’s part of our fight or flight instinct. And believe it or not, we can call on it when it’s time to get raunchy. There is always a reason not to have sex: you’re exhausted, your stomach hurts, you have to get up early. But if you let those reasons win, you’ll wake up one day and realize you haven’t been physically intimate in a long time. And that actually affects your feelings of emotional closeness. You know if you pulled yourself together, you could fit in a great love-making session. So do.