Females of their species are deadly allergic to smurf berries. Smurf berries are their main source of food and energy and since they are allergic to them most females die at an early age. For some reason Smurfette is immune. Doesn't matter know, Wendy Testaburger killed them all. Never forget....
"Smurfette was the only female Smurf until the creation of Sassette. A Granny Smurf was also later introduced, although it is unclear how she was created. Thierry Culliford, the son of Peyo and current head of the Studio Peyo, announced in 2008 that more female Smurfs would be introduced in the stories."
-from Wikipedia
Are the smurfs making a bit of a come back? coz i noticed about 3 - 4 days ago in Hong Kong there were two Smurf mascots walking around town for some reason?