I had some experience with this kind of site several
years ago as a result of an ad on CL. Your card number,
even if they say they are just using it for age verification,
does not stop there and I actually had to cancel that card
and have it re-issued. There was never anything available,
such as a personal meeting, even though the lady claimed
to be local and the site was just for "getting acquainted."
Am older and wiser, now.