It is considered rude not to have eye contact with the person you are communicating to especially if it is your first time meeting. It shows a lack of respect for that specific person.
-Some people in other countries may find eye contact as a challenge or offense, so be careful when you go to a foreign country.
-Staring at someone with a different sex may lead to a big question mark.
-If you feel that the person you are contacting with is feeling uncomfortable with your eye contact technique then I would decrease my eye contact.