women are just much more satisfied than men

Whether we are male or female, we should know what we are worth as a person and in terms of our track record and merits. So whatever gender, if we "know" that we can contribute successfully to a business or organisation and have the credentials then, yes we should ask for a salary which matches our abilities and potential without being too greedy.

done

women are less risk takers

The principle of output, outcome and work production should be the only one used for negotiating salaries.

why do males have to get paid more

Women tend to negotiate for higher salary less often than men do mostly because they are not conditioned by the society to feel entitled, and at present situation they mostly tend to be appreciative of just having secured a job. May be this will change with time as the feminist movement progresses and attain normalcy.

salary negotiations, I think should be based on the employee productivity and on the cost of living.

Men and women have different aproaches a job negoiations differently. Men seem to want more than offered and women seem to settle for whatever they are offered. Make sure that you are getting the fair offer that everyone with your skills and job duties is getting then same pay salary

Women should be paid the same as men to make it a fair society