How do you remove latex based paint from the skin?

Soap and warm water should do the trick with latex paint. Don't go around trying to get it off with paint thinner or acetone; those are for oil-based paints. If it's a good quality paint or dried hard, you might have to scrub a bit, but if it's still wet it will come right off. Hot water and scrubbing with my finger tips works well for me. Our skin is porous, whatever we put on it is absorbed by our bodies through the blood vessels. Never put thinners or similar solvents on your skin, especially acetone, tolulene, etc.