Looking to meet and spend time with a quality person. It's all about positive energy and surrounding yourself with a person who motivates you to be a better person, who makes you feel invincible, who makes you feel like you can take on the world no matter how crappy your day was. There is nothing better than sharing a look and a smile without saying a single word!
The defintion of chemistry: 1.The elements of a complex entity and their dynamic interrelation 2. Mutual attraction or sympathy; rapport. We are all complex entities, we are human, therefore we are flawed. Although, its our flaws that makes us who we are. Great chemistry between 2 people is being able to deal with the flaws, laugh at each others mistakes and yet still not change a thing about that person.

I guess it really doesn't matter as long as you are with someone who is fun, interesting and great conversation is going on. Could be from sharing a run in the park, a walk by the river, dinner on a rooftop or a drink at the corner bar.