Do: Pay attention to my cat. Pet him, talk to him, play with him.
Don't: Piss off my cat by petting him till he struggles to get away. If you can't manage to figure out what the *cat* wants, you certainly aren't welcome in my bed.
Do: Be on time.
Don't: Set up a date for right before you have to be somewhere else, show up, and then excuse yourself half an hour into it (assuming it wasn't a half-hour date arrangement) to go somewhere you knew you had to go when you asked me out.
Do: Show some interest in what I do and talk about shared experiences.
Don't: Try to BS me by proving that you know more than I do about my occupation. Not only do I have an edge in spotting anything you fudge, it also tells me that you have no respect for my intellectual capabilities. If you're gonna do this, might as well stare at my chest through my shirt, that's all you're gonna see.
Do: Behave in a polite and restrained manner. Tip the waitstaff.
Don't: Be so cheap that I sneak back to the table after you go pay the check to leave the waitress more than a buck on a $30 tab. Don't call people horribly nasty names, even while driving and they can't hear you. It makes me wonder what you're going to call ME when I tick you off.
Do: Pick up your place if I'm coming over. Dirty laundry, food dishes, porn mags, what have you. It shows me that you care, AND gives me somewhere I can sit without being afraid I'll get salmonella of the butt.
Don't: Have the place so spotless that.... uh, well, actually I've never had that happen. Nevermind. I suspect a guy who kept a house too clean wouldn't date ME...