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Anonymous C joined in and replied with this 1 year ago, 2 hours later, 4 hours after the original post[^][v]#1,304,970
Viagra is a kind of drug called a PDE5 Inhibitor, PDE5 is an enzyme in the body which is found all over but is concentrated in the flesh of the cock.
When a man becomes aroused, Nitrous Oxide is released into the penis, which activates another enzyme to form a compound called cGMP. This allows the muscles in the penis to relax, which increases blood flow and causes an erection.
PDE5 signals the body to end producing cGMP and also breaks it down, which causes an end to the erection.
When a person takes a PDE5 Inhibitor like Viagra, this breakdown takes a lot longer and therefore the erection lasts longer and the penis remains firmer during.