The mechanism of exposure can be briefly described thus: during sexual stimulation, a man produces a large amount of cyclic guanosine monophosphate (cGMP), the effect of which on the body is to relax the smooth muscles of the . This in turn leads to an increase in their blood supply, which contributes to the appearance of an erectionThe mechanism of exposure can be briefly described thus: during sexual stimulation, a man produces a large amount of cyclic guanosine monophosphate (cGMP), the effect of which on the body is to relax the smooth muscles of the . This in turn leads to an increase in their blood supply, which contributes to the appearance of an erection.

The mechanism of exposure can be briefly described thus: during sexual stimulation, a man produces a large amount of cyclic guanosine monophosphate (cGMP), the effect of which on the body is to relax the smooth muscles of the . This in turn leads to an increase in their blood supply, which contributes to the appearance of an erectionThe mechanism of exposure can be briefly described thus: during sexual stimulation, a man produces a large amount of cyclic guanosine monophosphate (cGMP), the effect of which on the body is to relax the smooth muscles of the . This in turn leads to an increase in their blood supply, which contributes to the appearance of an erection.