So let's take this on out to meeting up with someone you have never seen as much as a picture of. How in the hell are you going to know if they show up or not? Now this does not mean that perhaps you sent a picture and they know what you look like and will find you but even then 3 sets of eyes (theirs and yours) looking makes it a lot easier to find each other. Then you get into the fact that a cyclops Quasimodo would have a very hard time overcoming looks with personality. Yeah I know that is somewhat shallow but still there is a certain point in the looks department that everyone will draw the line at. Now it is a different point but knowing it is there up front can save a lot of wasted time.
Now this brings us to the safety issue. Regardless of how well you think you can handle problems there is always the chance that in the end you show up and are met with an unexpected group intent on doing harm to a "pervert" instead of the expected couple. This is especially true given how people do such things to post a video of them being a jackass or worse. Now this does not mean a picture sent makes it any less of a potential however the fact they refuse to send one at all raises the question "What else are they hiding about a potential encounter?"

