Testosterone is truly a life source to the male body. Produced primarily in the testes by specialized Leydig cells, testosterone travels through the body via the bloodstream and binds to receptors on target tissues. There are testosterone receptors all over the body. As might be expected there are many in the genital area. However, the largest concentration is in the heart and brain. It is the receptor sites in the brain that create sexual desire which in turn trigger the release of nitric oxide to facilitate an erection.

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