It's a med, meant for something else, but it's off label use is that it makes it easier for you to finish and more often. It's sometimes given to people who take anti-depressants, which can sometimes cause "anorgasmia", eg you can get it up fine, but you just can't finish no longer how long you go for.. It does work for it's off label use on normal people as well, as in if you've already had 4 in a day it might help you finish again, however wouldn't recommend it if you've been on a drought... you're likely to pop before the zip is down ;)