The Onion

In general, female is an adjective. It can be used as a noun, but generally shouldn't be, at least when talking about humans. So you can say "my female colleague" or "a woman I work with". You can say "the female mind" or "a woman's brain." You can say "a panel of female postal workers" or "a panel of women who work for the post office." If you stick to the adjective/noun rule, you'll come off far less offensive/gross sounding. Hope this helps.