Allow us to reiterate: observation, no matter how simple, can be the key to approaching men. Women have an advantage over this since they are detail-oriented. Ladies, start by taking in your immediate surrounding and comment on it. Take it even a step further and comment on something you've observed about him. Your comment can be simple, one-liners. You don't have to Sherlock the guy. Take this as an example, you see a cute guy down the street and he is standing by his motorcycle:
"Woah, I can't help but notice that cool bike. What is it?"
He'd proceed to tell you about his motorcycle. If you happen to stumble upon a bike enthusiast, he might just give you a complete rundown of his engine. Then, you could navigate your conversation like this:
"I'm Jen, by the way. Oh, what's your name?"
"Great, lovely to meet you, Mike. So, what are you doing around here?
When he proceeds to explain about his business, you can try to find a common ground for you both. This gets the conversation flowing while building the rapport with each other.
"Oh, you're doing that? That's very interesting. I have a friend who does that, too. You know what, we should exchange numbers. I'd love to get to know more about you."
Once you initiate asking for his number, the direct approach shows you to be confident, friendly, and a go-getter. He might even be impressed at how easy it was for you to approach him and start a conversation. Remember, guys get rejected more often than women. So if you actually start being direct, they can be more receptive towards you.