Kamagra Oral Jelly relax the blood vessels in the penis increasing blood flow and causing an erection, which is the natural response to sexual stimulation. However,Kamagra Oral Jelly   will only work if you are sexually aroused.  Kamagra Oral Jelly contain sildenafil which acts on the erectile tissue of the penis to increase blood flow which causes an erection  . During sexual stimulation nitric oxide is released in the erectile tissue of the penis which activates the enzyme guanylate cyclase.