I am not referring to our species, although I guess I could be.
No, I the species that viagra will protect are those previously used in oriental medicines.
Now, I suppose that a few oriental medicines have real and measurable benefits. I suspect that as more medicines tested in double-blind studies become available, fewer and fewer oriental medicines will be sought.
From the Korea Times (in an ‘https:’ format as they often and inexplicably are):
The oriental medicine market has faced setbacks over the past few years and observers are pointing their fingers at the rapid spread of erectile dysfunction treatment drugs as one of the major causes.