well ya see, female smurfs actually absorb seed through their entire body. So once every few months all the smurfs get together in a clearing, and smurfette lies naked on the grass in the middle. The male smurfs start pleasuring themselves as Smurfette starts putting on a show. Then, one the elders, such as Papa smurf, will give the signal, a clap, usually, and the villiage will proceed to run up to smurfette, still rubbing themselves. Then, as each smurf nears orgasm, they will push to the front and contribute their genetic material. This will continue until the entire villiage is spent and smurfette is swimming in a blue pool. It is imperative that she absorb as much genetic material as possible, so she must rub as much of into her skin as she can manage. Swallowing the material and absorbing it through her eyes are also suitable, so she can drink it and allow it to flow into her eyes. It takes a few days for her body to fully absorb this material and process it, more depending on how much she has received. Usually after about a week she is ready to give birth and will retreat to a dark tunnel in the earth to lay her clutch.
After the young smurfs hatch they must be nourished with smurf milk, which is, ironically, all but identical to smurf sperm. The one difference is that smurf milk makes it more likely that a smurf larva will develop into a new smurfette. Smurfette likes her position of decadence and sloth and so will not allow this. For the few days that smurf larva can only subsist on smurf milk they will be fed by males with smurf sperm so that smurfogen does not develop and make them female. Due to the consistency of sperm, this must be fresh, other wise it's no good, the babies must be fed "fresh from the tap" as it were.
how's that for ruining childhood?