Normal male sexual function generally starts with sexual desire or libido involving the stimulation of the brain, nerves, blood vessels and hormones, and the erection of the penis by becoming firm, the release of semen (ejaculation) and ends finally with having an orgasm. An erection is achieved when the muscles of a set of spongy tissues in the penis, namely the corpora cavernosa, relaxes to allow the inflow of blood into the spongy tissues resulting in the expansion and firmness of the penis. To sustain this erection, another set of muscles blocks the outflow of blood once an erection is achieved.
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