1. In all debilitated persons; as they do not possess sufficient vital spirits, and their strength after this venerating emission is consequently much exhausted. Their digestion necessarily suffers, perspiration is checked, and the body becomes languid and heavy. 2. In the aged; whose vital heat is diminished, whose frame is enfeebled by the most moderate enjoyment, and whose vigour, already reduced, suffers a still greater diminution from every loss that is accompanied with a violent convulsion of the whole body. 3. In persons not arrived at the age of maturity; by an easy intercourse with the other sex, they become enervated and emaciated, and inevitably shorten their lives. 4. In dry, choleric and thin persons; these, even at a mature age, should seldom indulge in this passion, as their bodies are already in want of moisture and pliability, both of which are much diminished by the sexual intercourse, while the bile is violently agitated, to the great injury of the whole animal frame. Lean persons generally are of a hot temperament; and the more heat there is in the body the greater will be the subsequent dryness. Hence, likewise, to persons in a state of intoxication, this intercourse is extremely pernicious; because in such a state the increased circulation of the blood towards the head may be attended with dangerous consequences, such as bursting of blood-vessels, apoplexy, etc. The plethoric are particularly exposed to these dangers. 5. Immediately after meals; as the powers requisite to the digestion of food are thus diverted, consequently the aliment remains too long unassimilated, and becomes burdensome to the stomach. 6. After violent exercise; in which case it is still more hurtful than in the preceding, where muscular strength was not consumed, but only required to the aid of another function. After bodily fatigue, on the contrary, the necessary energy is in a manner exhausted, so that every additional exertion of the body must be peculiarly injurious. 7. In the best of summer it is less to be indulged in than in spring and autumn; because the process of concoction and assimilation is effected less vigorously in summer than in the other seasons, and consequently the losses sustained are not so easily recovered. For a similar reason the sexual commerce is more debilitating, and the capacity for it sooner extinguished in hot than in temperate climates. The same remark is applicable to very warm temperature combined with moisture, which is extremely apt to debilitate the solid part. Hence hatters, dyers, bakers, brewers, and all those exposed to steam, generally have relaxed fibres.