Orgasm men are capable of achieving them is supported by men who have reported having multiple, consecutive orgasms, particularly without ejaculation. Males who experience dry orgasms can often produce multiple orgasms, as the refractory period is reduced. An increased infusion of the hormone oxytocin during ejaculation is believed to be chiefly responsible for the refractory period, and the amount by which oxytocin is increased may affect the length of each refractory period. Another chemical which is considered to be responsible for the male refractory period is prolactin, which represses dopamine, which is responsible for sexual arousal. Because of this, there is
Refractory apertures etc. Special shapes are specifically made for specific locations within furnaces and for particular kilns or furnaces. Special shapes are usually less dense and therefore less hard wearing than standard shapes. Precast refractory shape technology has become a specialized field within the refractory industry in recent years. As demands increase for greater refractory lining performance and lower maintenance costs, refractory users are finding that one effective way to achieve those goals is to incorporate a broader use of precast refractory shapes into their lining systems. Across virtually all industries – petrochemical, steel, power generation, metal casting and treatment, wood