Fig. 1 from the Amaral et al article in Molecular & Cellular Proteomics: human sperm tails can be physically isolated by sonication and sucrose gradient.
Sperm motility describes the ability of sperm to move properly through the female reproductive The energy for this process is supplied by ATP produced by mitochondria. The velocity of a sperm in fluid medium is usually 1–4 mm/min.
Semen, also known as seminal fluid, is an organic fluid that may contain spermatozoa. . "Jing" is sexual energy and is considered to dissipate with ejaculation so . In Baruya culture, there is a secret ritual in which boys give fellatio to young.