Sperm washing is the process in which individual sperms are separated from the semen. The gametes (sperms and ova) are produced in the swollen gonads, around the stomach. The offspring viability benefits are increased by multiple and variable sperms through ejaculates. Both males and females can produce sperms to fertilize their partners. During "in vitro" fertilization, the sperms were cleansed of HIV. CB is present on Leydig cells and human sperms. The spermatophore may also have nutrition in addition to sperms as a "nuptial gift". There were many hypomethylated regions in both sperms cells and ESCs that showed structural differences. Rotatory or shaky motion of sperms indicates presence of antispermal antibody. So, it is now seen to be surrounded by the tails of the dead sperms.