It should be perfectly legal to buy them online and deliver them to you by mail because it’s not drugs or any other illegal substance.
If you want to see the source, I get Viagra from, then
go to this website. It’s the most reliable source I could find on the Internet because all the pills they sell have been tested and are safe to take. However, I would still advise you to see a doctor before taking anything and discuss your problems. It’s always better to ensure you take something for your own benefit. Otherwise, it would be risky and probably harmful.