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Retrograde ejaculation occurs when semen which would be ejaculated via the urethra is redirected to the urinary bladder. Normally, the sphincter of the bladder contracts before ejaculation, inhibiting urination and preventing a reflux of semen into the bladder. The semen is forced to exit via the urethra, the path of least resistance.
Huanjing bunao (traditional Chinese: 還精補腦; simplified Chinese: 还精补脑; lit. 'returning the semen/essence to replenish the brain' or coitus reservatus) is a Daoist sexual practice and yangsheng ("nourishing life") method aimed at maintaining arousal for an extended plateau phase while avoiding orgasm.
[11] A second method involved the man applying pressure on the perineum, thus retaining the sperm. While if done incorrectly this can cause retrograde ejaculation, the Taoists believed that the jing traveled up into the head and "nourished the brain." [12] Cunnilingus was believed to be ideal by preventing the loss of semen and vaginal liquids.
Around the start of the first millennium, Tantra began to include practices of semen retention, like the penance ceremony of asidharavrata and the posterior yogic technique of vajroli mudra. They were probably adopted from ancient, non-Tantric celibate schools, like those mentioned in Mahabharata .
A 1992 World Health Organization report described normal human semen as having a volume of 2 mL or greater, pH of 7.2 to 8.0, sperm concentration of 20×10 6 spermatozoa/mL or more, sperm count of 40×10 6 spermatozoa per ejaculate or more, and motility of 50% or more with forward progression (categories a and b) of 25% or more with rapid ...
Sperm storage organs in the fruit fly Drosophila melanogaster.Female was first mated with GFP-male and then re-mated with RFP-male. Female sperm storage is a biological process and often a type of sexual selection in which sperm cells transferred to a female during mating are temporarily retained within a specific part of the reproductive tract before the oocyte, or egg, is fertilized.