I wouldn't say its necessary, but it definitely helps. I used to be really insecure about myself around other people and avoided eye contact if I could. In most situations I would have been fine, but eye contact helps when your trying to sell people stuff so I had to learn. Turn it into a big game of chicken. Keep eye contact until the other person shifts their gaze.
Also, I couldn't help but notice how much eye contact worked when it came to talking to women.
Also, I couldn't help but notice how much eye contact worked when it came to talking to women.