Salary negotiations shouldn't be limited to just salary. Salary pays your mortgage, but terms build your career.
The point of the feminist movement wasn't simply to set our underwear on fire and muscle into small spaces in the male-dominated workplace, but to create a world where the contribution of both sexes was equally valued and no one's worth was judged on their take-home salary.
When it comes to salary negotiation, don't forget that salary is only one term of employment. What else is on the table - vacation time, benefits, bonuses, flex days? Before determining that these terms are 'must-haves' or 'giveaways' to get a bigger salary, find out what the counterpart has to offer.