That would mean that if an ejaculation happened hours ago and there was urination, there is no viable sperm left in the urinary tract and not in precum. Sperm is actually very fragile, and precum is designed to clean out the urethra of the male of any organisms that might harm sperm. The acids in urine do that. So if a male urinates he often is killing any sperm that might be left anywhere in the tract.

Sperm must be in semen and protected to live at all. As males get sexually excited they produce, mostly unknown to them, a small amount of precum that does not contain sperm (though it may have viruses or bacteria in it). Unless that precum is produced inside of the vagina during sexual arousal it is not at all likely to create a pregnancy. Ejaculation of semen with sperm inside of it, inside of the vagina or even at the opening CAN cause a pregnancy. There is a big difference.

In a shower as you described it, there is no need to worry. In taking a shower together if there is no ejaculation into the vagina, there is no sperm to cause a pregnancy.

I hope this answers your questions, and feel free to write again if you have more.

Reviewed by Sexual Health Editorial Team