If you're trying to have "intellectual" conversations with women you find attractive, you're doing it wrong.
You can have those conversations with friends, not with people you're getting to know for the first time.
One of the most important aspects of talking to a woman is making her laugh.
I try to see everything from the lense of humour, for example if I'm in a club with a girl and there are a couple arguing beside us, I'll provide a running commentary.
Or if I'm about to get a drink from a bar and start a random conversation with a woman behind me, I won't talk about what I find interesting or ask her questions. I would look for the humour angle.
"Hey, can you do me a favour? I'll let you go in front of me if you order my drink for me. All the bartenders are dudes, and they'll give you more attention than they'll give me. I don't usually use women just for their bodies this early on in the relationship, but in this case I'm going to make an exception".
It also helps to have an interesting life or have had a lot of worldly experience, that way you can talk about all the things you've done and even show them pictures (as social proof).
Most women (or people for that matter) don't have interesting lives, so talking about yourself in this instance is an exception.