"Male" should be an adjective unless you have good reason for it not to be. Use "man" and "woman" when appropriate.

Do not write:
The elevator was full of females and I hadn't showered that morning.

Write:
The elevator was full of women and I hadn't showered that morning!

Using "females" here makes it sound like you're doing animal behavior studies: The four females chased the amorous male over the hill and clubbed him with branches.