The fuzzy boundaries, variable definition, and popularity of neurasthenia rendered it wide open to countless postulations about its aetiology. These theories reflect the scientific thinking of the time and the interest of the particular writer.

The various explanatory models can be grouped as follows.

• Predisposing: genetic, personality.

• Social: industrialization, overwork, complexities of modern civilization.

• Organic: toxins, infections, endocrine imbalance, poor nutrition, toxic effects of damming the libido, hypotony of muscles, electrolyte imbalance, failure to acclimatize.

• Psychological: idleness, avoidance of work, repression of psychic conflicts.

• Mediating mechanisms: weakening of nervous or psychic energy.

5 Secrets to Lasting Longer In The Bedroom

5 Secrets to Lasting Longer In The Bedroom

How to increase your staying power to extend your pleasure-and hers. There are many techniques, exercises and even devices, aids, and drugs to help you last longer in the bedroom. However, in most cases, the main reason most guys don't last long is due to what's going on in their minds, not their bodies.

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