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Repeated penile stimulation, which either increases blood flow to the chamber and stiffens the muscle or strengthens the contraction, is necessary to achieve an erection. It has given rise to many subfields in psychology and philosophy that deal with mental states, emotional contamination, and influence. Rigid erection is the term used to describe the process when the tension within the erectile chambers reaches several hundred mmHg. Some drugs, like super vidalista , are used to treat ED. When an erection happens at the right time, many men describe it as pleasurably full and impression-sensitive. However, the erection becomes quite uncomfortable if that happens suddenly. The male penis has two cylindrical, sponge-like forms.