If a guy cums on your upper thigh (near v) during the shower, is it possible for the sperm to swim in the stream to the vagina?

About swimming: Salmon swim upstream to the same area where they hatched. Sperm are so small that you can't even see one with a magnifying glass. Being in the shower means the water is coming down from above, at 2 gallons per minute, unless it's one of those fancy Jacuzzi showers with water going sideways. Anyway, sperm are not salmon and cannot swim upriver to migrate into a vagina for spawning. No worries.