When I was a younger man......It didnt take much. There was a time where I was driven mad simply by watching a woman's pulse in her neck. Yeah.....I'm pretty fucked up when it comes to my old addiction. I was at the far end of the scale when it came to observing my conquests. So for me it was primarily physical. I'm still driven by physical attraction, but intelligence and a great sense of humor really get my attention more than anything now.
When I met my wife for example, she was stunningly gorgeous, but I watched her intellectually emasculate a guy who was an absolute asshole to her. We met at a conference. She was one of the speakers at the conference, and after the days events several people met up in the hotels restaurant to share drinks. This guy was a mayor of a town in Missouri and he started off hitting on her, and when that didn't work, he began patronizing her. She let it go for a while, and he became even more emboldened. He assumed because she was gorgeous that she did not possess a superior intellect to his, and she finally crushed him in a conversation. I recall thinking "Damn! This girl is smart! She just crushed this guy! Good for her!" Later that evening I saw that she was also hilarious. I recall speaking to a colleague later and telling him that I had just met my future wife. We were engaged three weeks later, and have been married for over ten years now.