Many people believe there is no such thing as male menopause or late-onset hypogonadism. But BBC News has cited researchers who have concluded that it does, indeed, exist. even though it is rare.

The European scientists said male menopause affects 2% of middle-aged men. Men experiencing male menopause essentially have low levels of testosterone, which are associated with poor morning erection, low levels of sexual desire and erectile dysfunction.

The scientists from the University of Manchester conducted a study of 3369 men aged 40 to 79 from eight European centers and found low testosterone, or male menopause as they called it, was linked to other symptoms like depression, fatigue and inability to engage in sex.

Men with male menopause were also found to have some symptoms that have no association with low testosterone levels such as disrupted sleep patterns, poor concentration, feeling worthless, and experiencing feelings of anxiety, according to the BBC.

A health observer cautioned that the term "male menopause" may mislead some people into believing that every man is likely to experience it.

He suggested that the decline in testosterone concentrations in aging men is absolutely a natural and normal process that all men have to experience as they age.

Some testosterone preparations have already been licensed to treat late-onset hypogonadism, according to an article published in the June 2010 issue of Drug and Therapeutics Bulletin.

But hormone therapy is dangerous.

Some observational evidence suggests that eating certain foods and supplements, including salmon fish, seafood such as shrimps, oysters, garlic, vitamin C, arginine or peanuts, among other things, may boost men's libido.

Jimmy Downs and editing by Rachel Stockton