People sweat to cool down and also as an involutary response to concentration.
Some people 'run' hotter than others - kinda handy if you want to live a long life, heal quickly and retain your mental faculties, but a pain in the posterior sometimes on the dancefloor. A few shirts a night is a small price to pay for a faster heart beat imo 
The less effort you put into your dance will also impact how hot you get, so its true the better you dance the less effort it will take for you to dance ergo the less you will sweat, but high energy moves, high concentration / focus on the dance + the music :: you will sweat with that combo no matter what
Seriously people who are born without sweat glands are genetically gifted???? Yeah right... I dont think so .... 
- Edited by Hugh1a on 28/06/2010 at 16:43