1. The umbrella
Sometimes the umbrella is just not big enough to cover both of you completely. In this case, a gentleman would obviously lean the umbrella towards his lady friend. Guys, getting a little wet won't kill you, if anything it'll get you some extra points for later that night when she sees that you sacrificed a shoulder for her to be nice and dry. A true gentleman is always thinking two steps ahead.
2. Walking on the sidewalk
Most men don't know this, but making sure the woman is on the inside of the sidewalk is crucial. Don't ever let her walk closest to the street where cars are driving. Holding her hands will make her feel safe, but make sure you let her know, if there is any danger, she is farthest from it. And if there was any imminent danger from the street, you are there to protect her. Attention to minor details such as this is what distinguishes a gentleman from a gentle man.
3. The towels
Again, the gentleman is always keen on details. When a woman steps out of the shower, you should be there to hand the towels to her. I say towels and not towel because a woman needs two towels. We men just use one big towel but, we don't have those lovely long locks like Rapunzel. A woman needs a towel to dry her body and another one to wrap around her hair. Details gentlemen, details!
4. Offer your jacket
The weather seems a bit more chilly than what the weather said, and your lady friend really seems to be feeling the wind chill. No worries! Because she is with a gentleman, and he is not afraid of the cold. Offer your jacket, but NEVER let her know that you may be cold. Don't show her any signs of the weather getting to you, and don't remind her of the weather. Simply let her know you are okay, and make sure she is warm, that's all you care about.
5. Introduce her
When attending a social gathering, its your duty as a gentleman to introduce your lady friend to the rest of the crowd. It's not about flaunting her, but more about letting her feel comfortable. Having her stand next to you while you talk to your friends is rude and very disrespectful. She doesn't need to be treated like a trophy that you carry around. Make her feel comfortable, let your friends be her friends. Briefly introduce her to the others, making sure she is physically included in the conversation.