Round 1

Dear Gentlemen,
It is not appropriate to honk your horn as a signal to your date that you have arrived and she should come out.
Love, The Ladies

Dear Ladies,
Don't go on the date with the guy who honks his horn, wait for the real gentleman who comes to your door. Yes, we do exist.
Love, The Gentlemen

Dear Gentlemen,
When you are invited to someone's house for dinner, offer to help clean up by asking the host/hostess "what can I do to help?" Sometimes the answer is "nothing" and that's fine but at least offer. We notice.
Love, The Ladies
P.S. Don't just offer to help the girl you are trying to impress help everyone, it makes a difference.

Dear Ladies,
Please be ready on time. We're nervous enough as it is, we don't want to wait in the front room for 30 minutes making awkward small talk with your roommates while they judge us. Plus, we put effort into planning a date, please give us the courtesy of being ready on time.
Love, The Gentlemen

Dear Gentlemen,
It is creepy to hit on the 18 year old girl just because she is legal now, if you feel you must pry on the young and inexperienced, you may need to re-evaluate why no ladies your own age will go out with you.
Love, The Ladies

Dear Ladies,
If you like a guy and he's asked you out, show it. We understand playing hard-to-get, but the cloak and dagger bit is a little wearying.
Love, The Gentlemen