Retrograde ejaculation
In males, retrograde ejaculation occurs when the fluid to be ejaculated which would normally exit via the urethra is redirected towards the urinary bladder.This may cause a couple to have problems with infertility, as most sperm do not get to the vagina and the rest of the female reproductive system.
As a method to induce pregnancy, the retrograde ejaculator's urine is centrifuged and the isolated sperm is then injected into the woman.
In the past, in couples where the male has had retrograde ejaculation, the man has urinated into his wife's vagina in an attempt to conceive.