If you think having frequent lackluster sex inches you closer to drawing the shades and diving head first into a Bell Jar-type depression—you may actually be correct. Bad Relationships May Be Genetic

A recent study of 295 women between the ages of 20 and 65, both pre- and post-menopausal, proved that those most dissatisfied with their sex lives are also significantly less content in general. Keep in mind, however, that "dissatisfied" doesn't mean "non-existent." All the women surveyed were getting laid at least twice a month, 90 percent with a regular partner. So it isn't as if a string of demoralizing one-nighters or long dry spells can be to blame for the moods of these women. As the lead author said:

We found that women who were sexually dissatisfied had lower well-being and lower vitality. This finding highlights the importance of addressing these areas as an essential part of women's healthcare, because women may be uncomfortable discussing these issues with their doctor.

Of course, the obvious question, is this a chicken-or-egg type of phenomenon? If they are battling depression, cursing the rising sun and their morning sex all equally, you can hardly blame lack of sexual chemistry or the relationship. Nor can you prescribe pharmaceuticals aimed to treat sexual dysfunction if there's something deeper.

Big picture wise, these results are relevant as they provide even further clues that a woman's sex life may be a good indicator of how she's faring emotionally. And perhaps further evidence how complicated the fairer gender is when it comes to satisfying sex. The Truth About Sexless Marriage