Refractory period (sex) after orgasm in which further sexual stimulation does not produce excitement. While the refractory period varies widely among individuals, ranging from minutes to days, most men cannot achieve or maintain an erection during this time, and many perceive a psychological feeling of satisfaction and are temporarily uninterested in further sexual activity; the penis may be hypersensitive and further sexual stimulation may feel painful during this time frame. An increased infusion of the hormone oxytocin during ejaculation is believed to be chiefly responsible for the male refractory period, and the amount by which oxytocin is increased may affect the length of
Milk substitute Milk substitute A milk substitute (or, more precisely, an analogue of mammalian milk) (also called milk alternative or milk analogue) can refer to a liquid considered (particularly in the USA and other western countries) as a replacement for the milk from a mammal (mainly cows and humans). Mammalian milk analogues are white or whitish liquids that resemble either dairy or human breast milk. Milk substitutes for non-infant consumption take two very different forms: plant milks, which are liquids made from plants and may be home-made or commercially produced, and coffee creamers, synthetic products invented in the USA in the 1900s