Welcome to Doctor Celine's Bank Sperm.So you wana donate your sperm Whats the reason?your wife wants become pregnantor you wana do it for scientific reasosons.Well right now we dont need any sperm But we are looking for some precum, its more useful for our scientific experiments. Remember PURE precum!The best way to produce the biggest amount of precum is to build up an edge become slower and buils up another edge and so on