Steve,
when i was 22-23, both my girlfriend and i took viagra to try it out. didn't change much for me or her, just raised body temperatures.
viagra is kinda like ritalin.. it doesnt have the desired effect if you dont have the disfunction.. if you take ritalin and you are ADD, nothing happens. if you take it when you are not ADD, its a stimulant.
its an interesting experiment, but it will be disappointing if you are expecting anything different. imagination, experimentation, now then you might find something that serves the purpose