Difference between friendly eye contact and sexual eye contact during conversation?

How do you tell the different between friendly eye contact and sexual eye contact during conversation with a member of the opposite sex?

I tend to make a lot I eye contact with people however when I’m being friendly and courteous, I tend to look more at their face. But when I’m into someone, I’ll stare right into their eyes
Difference between friendly eye contact and sexual eye contact during conversation?
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