Makey Makey type of buttons on somebody's body.[QUESTIONS]

Hey so I want to make a keyboard makeymakey type of controls on a person.

1-So is this possible? does the person has to have piercings?

2-If it doesn't need piercings , do you think the conductivity of each button will be affected by sweat or static electricity?

3-Can I mix a conductive material on each paint?is this the best way to make circuits? what is the way to make it with less lag?

4- Can I make a slide volume controller easily?how do I do this?

5-Can I make the connection to the arduino wirelessly? this would add a degree of coolness exponencially related to the performance of the dancer :P

Thank you, I'm a potatu