while im not sure completely about how viagra works, most “male enchancement” pills simply increase the overall blood flow of the body, increasing blood flow to the penis, which makes it look bigger, and the effect only lasts as long as someone takes the pill.
And with viagra, id imagine its just the same thing but in a much more concentrated dose.
So youd probably just feel very hot, because of the increased blood flow.
Sorry this is anti-climactic, im sure you were probably expecting fatal results, ive heard some pretty strange guesses.

cialis is actually used in the treatment of congestive heart failure in addition to treatment for ed. it increases the diameter of blood vessels, which is why it also helps a man get an erection.

Early studies of Viagra and women found it didn’t work, but doctors say those studies weren’t selective enough and included women with desire disorders who, like men with such problems, can’t be helped by Viagra.
As with men, Viagra gets the blood flowing to the genitals in women. So for women who have difficulty achieving orgasm, vaginal dryness or a lack of sensation, arousal or engorgement, Viagra may help.
More here - http://www.viagra.su/if-woman-takes-viag…