they are stinky because when they are not clean or if they get wet they will stink if they arent dried or moistourizedThe foot is generally relegated to the high humidity, low air exchange...
If you go swimming in a pool you don't need to wear anything but if you are going swimming in a natural waters like lakes, rivers, ponds, and oceans you need to wear water shoes (water proof).
Basically, you are cutting off the blood flow to that part of your body. When the blood starts to return that's when it feels all "tingly". Your touch receptors (the neurons that help you feel stuff)...