Who's more comfortable holding eye contact? Male or Female?

In your experience, do you think women have more ease holding eye contact while speaking to you or is it men who have less difficulty looking at you in the eyes during interactions?

Think back several years and give me an explanation if you can.
Update: My debut in question-asking.
Update 2: I'm asking for generalizations here guys! I know no individual is the same, but there has been a trend in my past experience. Women have often had more ease at looking at me when talking, like it was natural. But guys generally had more difficulty.
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