Do people who are more reserved have more trouble creating attraction for the opposite sex?

I constantly hear this from girl, I just don't feel a spark between us. I mean I always feel like the date went well and we always have great conversation and usually always get a kiss at the end, so then why do they come out of left field with I don't feel a connection or I don't feel any spark? This is always after a date or two. Rarely do I ever get a third date.

Do people who are more reserved have more trouble creating attraction for the opposite sex?
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