For an erection to occur, a series of events must take place.
The first event in this chain is psychosexual stimulation. This is promoted by the male sex drive, also known as libido. The mind then sends impulses down the nerve pathways to the penis. These nerve impulses relax the smooth muscles of the arteries which supply the penis with blood.
This muscle relaxation of the arteries leads to increased blood flow, engorgement and erection of the penis. This process can be significantly enhanced with an Arginine and Pine Bark Extract supplement.
After orgasm, the blood is returned to the general circulation and the penis returns to a soft (flaccid) state. This is caused by a neurotransmitter called cGMP, which can be successfully blocked by the famous prescription “blue-pills” stopping the erection from subsiding.
Even a minor disturbance in any of these steps such as decreased blood supply, disturbances of nerve mechanisms or psychosexual problems may lead to erection problems.
Here is an informative video about the process from sexual stimulation through to orgasm.
I used to struggle getting an erection consistently strong enough to satisfy my wife.