If you're asking a woman out to dinner, leave the flip-fiops, tank tops, and shorts at home. How you present yourself physically relates to how you will represent yourself in a relationship. Your first physical impression really does make a long-lasting impression on how she will remember you. So when choosing what to wear, reach for that nice dress shirt, pants, and closed-toed shoes.
No matter how good you think your natural smell is, put on that deodorant and cologne, and brush your teeth. There really is something chemical that happens to a woman when she is attracted to your smell. So make sure that smell is good!
Open her car door
Not a lot of men do this anymore, so be one of those few men that does! Before she even has the chance to reach for her car door, grab the handle, open the door for her, make sure she securely gets in, and close the door once she is safe ans secure inside your car. This not only gives her the impression that you are a gentleman, but it lets her know that you are concerned about her safety as well.
Pull out her chair in the restaurant
The number of men that actually do this action are dwindling as well, so be one of those selected few. Similar to opening her car door for her, pulling out a lady's chair lets her know that you care about her well-being before yours, and that is always an attractive feature in any gentleman.
Pay for dinner!
(Especially if it's the first date.) After you've been married for a few years, then you can start being more lenient with this idea, but until then, pay for dinner. Yes, there are a lot of women who take pride in making their own money, and who can clearly take care of themselves. But when you are dating, you should let her know that this is not one of the times when she needs to worry about anything, including paying the bill. This is her time to sit back, relax, and be catered to, by you. If she insists on paying, then offer to half the bill or let her get the next one. But if she doesn't, be prepared to pay for the dinner. Don't worry, it will pay off later! ;)
There are other ways to be a gentleman such as walking on the side of oncoming traffic, and holding her coat for her to put on when you're leaving the restaurant, but by following the tips mentioned here, you should at least get that second date.
Remember, the number of real gentlemen that exist in this day and age is definitely disappearing. Take action, and be one of those gentlemen, before they all become extinct. Good luck!