I DON'T NEED (or want) VIAGRA!!!!!!!!

Why am I getting 5 - 10 junk emails every day advertising viagra? Most of them are from Canadian Pharmacy, but there are many others with many different spellings (I don't know whether this is deliberate or a lack of grammatical skills).  Now, if you had something interesting to offer a 63yr old female, I might at least take a look, but viagra, please..........