Call women "females"
All females welcomed, is it? Sure, no problem, but which kind? Any animal with the right chromosomal makeup can be classified as a female, so you'll have to be more specific, sir. A lot of guys don't see this as offensive, but when you refer to a woman as a female in a non-scientific context or use the word in parts of speech other than an adjective, well, that's sexist and dehumanizing. How about trying something more accurate like "woman." Or, you know, calling her by her name.