Plutarch Quaestiones Convivales 3.6.2

[2] The youth, startled at this free declaration, sat silent; and the rest of the company desired Zopyrus to deliver Epicurus’s sentiment. He said: The particulars I cannot remember; but I believe he feared the violent agitations of such exercises, because the bodies employed in them are so violently disturbed. For it is certain that wine is a very great disturber, and puts the body out of its usual temper; and therefore, when thus disquieted, if quiet and sleep do not compose it but other agitations seize it, it is likely that those parts which knit and join the members may be loosened, and the whole frame be as it were unsettled from its foundation and overthrown. For then likewise the seed cannot freely pass, but is confusedly and forcibly thrown out, because the liquor hath filled the vessels of the body, and stopped its way. Therefore, says Epicurus, we must use those sports when the body is at quiet, when the meat hath been thoroughly digested, carried about and applied to several parts of the body, but before we begin to want a fresh supply of food. To this of Epicurus we might join an argument taken from physic. At day time, while our digestion is performing, we are not so lusty nor eager to embrace; and presently after supper to endeavor it is dangerous, for the crudity of the stomach, the food being yet undigested, may be increased by a disorderly motion upon this crudity, and so the mischief be double.