Specially for women there are two types of connection. Sexual and emotional.
Sexual connection just based on looks and attitude. If a guy is tall, handsome and masculine (confident, aggressive, dominant) women feel strong desire, lust or sexual connection.
It can happen in a short period of time. In a couple minutes. People can have sex just based on sexual connection. Don't even need to have emotional connection. Most hook up or ons happen based on sexual connection.
Then there is emotional connection. This is based on personality. If a guy share the same value with woman, they understand eachother and have great time together that's emotional connection. Emotional connection is relationship. It's rapport between two people. It's commitment.
Women can have emotional connection with one guy and have sexual connection with other guy. They prefer to have both with same guy of course.