What is retrograde ejaculation? It sounds nasty.

Backward ejaculation. Instead of the semen coming out of the penis, it goes backwards in retrograde fashion into the urinary bladder.
Retrograde. Retrograde ejaculation is a problem caused by a defect in the prostate and urethra. During ejaculation, instead of semen traveling down the urethra and out of the body, it travels backwards into the bladder. It will then come out with the urine when you go to the bathroom.