those endorphines sure are addictive

desires are pre existing when your born its food and shelter when you get older you add sex

the whole of human wants are based on chemichal dependence, getting high if you will, how long that high lasts and what makes it occur are products of experince and upbrining.

for example your desire to be diffrent (Sixx covered but just to drive it home) comes most likely from your inabaility to fit into some social group and you have learned thru experince that it makes you feel better to rebel against the requirments of that group then to attempt to live up to the standards of that group. This is not to insult you, every single person does this. The important aspect of this paticualr line of discussion is why would you want to fit into that group in the first place.