The notions of chivalry and honor aren't dead, but they're not thriving either. Not only will conducting yourself as a gentleman get you girls, it will give you something about yourself to be proud of.
Pay attention to how you look. Wear clothes that fit your body well, eliminate flashy clothing and avoid fashion "faux pas" (i.e. baseball hats cocked slightly to the side). A simpler wardrobe will keep the emphasis on you, not your clothes, which will change your outlook. Get regular haircuts.A true gentleman is polite to everyone. Always be aware of how you can help people. Wait an extra few seconds to hold the door for the person behind you. Offer to help an old or pregnant person get their grocery bags to the car. You don't have to be paranoid or risk killing yourself (i.e if you've got a precarious grip on something heavy, don't open the door for someone) but respect is paramount. Even if someone is being stupid, be polite and respectful.Don't swear. Ever.Give girls a little extra respect. Don't be obsequious, but neofeminism has kind of gotten rid of some basic politeness that they'll appreciate. Don't put every girl on a pedestal (we're all human) but they'll really appreciate it if you do them favors, like giving up your seat on the bus even though they're not carrying anything heavy.Don't talk about yourself much.Although girls like to know a little bit about you so she can understand what you are talking about sometimes. In addition to making you a much more desirable conversationalist, it will make you seem more mysterious, which many women find attractive. Get a basic idea of what's going on in music, sports, and politics.Learn to either avoid politics and religion until you know someone better, and learn how to be neutral if someone else brings it up. A simple shrug will do wonders. A gentleman doesn't make other people uncomfortable.Something guys don't really appreciate is that the world is more threatening for girls: they're automatically targets at night or in bad neighborhoods. Walk her to her door if at all possible. It doesn't matter how strong she actually is, if you're a girl people will go at you first, whereas by virtue of being male you're safer.When you're with your girlfriend, remember to keep doing nice things for her. If she's carrying something, pick it up when she puts it down. Show up with a card or a flower. Expensive and showy doesn't matter, it's the effort. In fact, a rose and a heartfelt kiss will keep any girl happy for days.There are some things you shouldn't talk to girls about. These include how hot other girls are, or anything at all of that nature. If she's not in to sports or video games, you can say a few things but then move on to something she's in to. Girls tend to be more interested in books and music than in sports and video games, though there are plenty of exceptions to every rule. It's fine to talk about that stuff with your guy friends, but a gentleman doesn't do that.Stand up for your girl. Don't go around punching everyone who looks at her sideways, but if anyone's giving her looks or unwanted advances, intervene. Put your arm around her shoulder and move yourselves away, or go to her and speak up for her. The physical contact reassures her and lets the aggressor know that he's got to deal with both of you.Always have a straight posture (nobody likes a sloucher)Do not talk down to a women ever. It's ok to tease but being cruel is not the way to go.Avoid fighting, as it isn't the best way to solve problems, but a real gentleman never backs off when he's challenged, always standing up for himself and his values. Keep the straight posture, even if your rival is taller than you. But be reasonable, never use weapons, such as guns, knifes and the likes, as this kind of "chivalry" is from the old days and might end up seriously damaging you. And never, never fight in/against a group, for a gentleman only duels, do not try to be Chuck Norris. If your opponent is down, that means you made your point and it's time to stop fighting. Offer him a hand to get up, always expecting a bad reaction, as he might not have the same values as you have.
