I love the graphs, they clearly show that women have far less sex when they are grumpy and in bad mood general, the effect is lesser in men but still exists. Other graphs clearly show that you should be satisfied with you life in order to get ahead. And negative view on life clearly hinder your ability to increase your income.
I'm note sure they showed which was cause and which was effect. I look at that chart and I see that unhappy people have less sex. Not surprising. On the other side, happier people have sex more often than unhappy people. Some happy have sex less often some have sex more often.