Women and Aircon

Why is it that people turn the heating up to 23 in winter, If its 23 inside in the summer they say its to hot.
Then turn the aircon down to 18 in summer. If its 18 inside in winter people say it freezing

Whats that all about??

Argh that used to piss me off so much! The whole point of climate control is regardless of the weather outside you can have a constant temperature. Why would you want that temperature to vary? 20 all year round thank you very much.