According to http://www.sexualityandu.ca/adults/sex-2–8.aspx:
“How often is often enough?
In the film Annie Hall, a disappointed Woody Allen tells his psychiatrist that he and Annie have sex “hardly ever, maybe three times a week.” Annie, however, sees it differently – she tells her psychiatrist they do it “constantly, I’d say three times a week.”
Levels of sexual desire can fluctuate, and are affected by many things – stress, fatigue, hormonal changes, aging, or a difference in sexual energy and drive between you and your partner. But when your sex drive is higher than your partners and your partner is telling you “not tonight”, it’s worthwhile to examine what the reasons might be:
* Life isn’t always a bowl of cherries. Unusually high levels of stress on the job, major life events such as a death in the family, a move to a new home or financial setbacks could all contribute to a reduced sexual appetite. But remember, sexual expression of some kind might be the best possible release for you when you’re under stress.
* Medications can play havoc with our bodies. Antidepressants, antihypertensives, alcohol, tobacco, illicit drugs – all of these can affect on your sex drive. Talk to your physician and your pharmacist about any side-effects you experience, and don’t be shy about mentioning what effect these may be having on your sex life. Sometimes a change in dosage is all that’s needed to solve the problem.
* Aging – hey, it happens to the best of us. It doesn’t mean the end of sex. What it does mean is that aging affects our body and may have some impact on our libidos. Hormonal changes in both men and women may change sexual desire, and chronic health conditions such as arthritis or backache may worsen as we age, making it difficult to summon much enthusiasm for sex.
* Exhaustion – Sexual energy has been described as the energy you have left over after all the activities of the day..It’s hardly surprising that many busy professional couples with kids have little energy left at the end of the day!
Discussing the subject openly and honestly is the best way to address the situation – and communicating outside the bedroom first is the key.
Don’t make it a fight. Don’t use guilt. And don’t let pride get in the way.”