After having sex with my wife, some sperms comes out from her vagina when she get up from bed. Is this normal?

Yes, it's normal.

Don't worry, there's plenty left to get her pregnant if you're trying to conceive.

Perfectly normal.

Turn a cup of water upside down... will the water run out... its the effect of gravity on a liquid.\

She could avoid that by learning to walk on her hands... but that's really not easy or practical..

Hello Jet,

That is a perfectly normal situation. Goodluck if you are trying to procreate!

-fdsaqwerish