Been reading a couple of threads here about eye contact. The most of them discussing eye contact are when you already are talking to a women.

What about eye contact with women you're interested in but yet haven't talked to? I usually go to the gym. I'm quite tall and well trained (since I play ice hockey), but still I don't think that I'm a good looking guy.

Now and then at the gym I get eye contact with women, but I don't know how to handle it. I can maintain eye contact til the woman look away, but maybe she's looking away and thinking "what a guy, he's staring at me?".

How do I know that I'm maintaining eye contact and not are staring?