He's exhausted

If a man's physically knackered it can quickly sap his sex potential. Being out of shape won't help either. Even if he's just overworked, the only thing he'll want to do in bed is sleep.

He's depressed

Loss of libido is a symptom in almost three quarters of all depression cases, so if he's got the blues then sex is the one thing he won't have on his mind. Depression is a treatable condition, however, and talking about the issue plays a central role in recovery. A man who seems depressed should be encouraged to see his doctor, who can recommend an appropriate therapy.

He's medicated

Certain antidepressants and recreational drugs like cannabis are known to reduce sex drive. Excessive amounts of alcohol, heroin and cocaine will also have a marked effect on his libido.

He's low on testosterone

Low levels of this male hormone can decrease his passion potential. Hormone replacement therapy will help, but only his GP can diagnose if there's a problem.

He's unwell

The slightest sniffle can leave some people switched off sex, and everyone knows what bad patients men often make. Everyone copes with illness differently, of course, just be aware that in some cases a loss of libido can be symptomatic of a more serious condition, from thyroid disease to pituitary gland problems.

He has 'issues'

If his head's full of hassles, then sex can easily be squeezed. It's not just everyday stresses and strains that can take the wind from his sails. Problems stemming from his formative years may still be troubling him, especially if they're sex related. He may not want to talk about it on request, but if he's aware that his partner is concerned and keen to help, he'll know who to turn to when he's ready.

He's complacent

Sex-wise, the early stages of a relationship are often highly charged. The physical attraction, combined with the excitement of being intimate with someone new, can be a potent combination. Over time, however, as the emotional bond begins to strengthen, and lives return to normality, the instinct to get jiggy at every opportunity may well diminish. Still, there's a fine line between being comfortable with your other half and being complacent, and if a partner is feeling neglected then they should let him know!

A note for partners:

If your boyfriend's off sex and you're worried then you have to talk to him about it. Just avoid raising the subject when he's rolled away in a bid to get some shut-eye, and keep an open mind!

Updated: 13/01/2009