It is well known that mycoplasma can cause infection in the male reproductive tract. Some studies indicate that Ureaplasma urealyticum (Uu), a species of mycoplasma, is associated with male infertility. Sulfogalactosylglycerolipid(SGG) is the major mammalian male germ cell glycolipid, synthesized via sulfation of galactosylglycerolipid in early primary spermatocytes. Some experiments have proved that SGG is implicated in sperm-egg binding by linking arylsulfatase A (AS-A), SGG's ligand on the egg. SGG can be desulfated by binding mycoplasmas and transformed galactosylglycerolipid, which doesn't bind AS-A. So the binding and degradation of the sperm SGG by mycoplasmas may play a role in the induction of male infertility. As a kind of mycoplasma, Uu can also bind SGG, which offers another explantion for the association of Uu infection with male infertility caused by Uu infection.