At this point, I wouldn't use them.  Here's why:

  - They demand a lot of personal information right up front such as your credit card number and security code.

   - They ask for billing address.  This is NEVER needed for a credit card transaction unless it is the same as "shipping address" and you are having something shipped to you.  Any website that asks for it and tells you that the card companies require it, is lying.  None of the card companies require it.  This goes for porn and non-porn merchants equally.  Oh, and it's my understanding that unless they are actually shipping something to you, most states actually prohibit asking for a an address or telephone number in order to process the charge.  I know NJ and CA both prohibit it.  As far as escorts are concerned, unless they are sending someone to your home, why would they need your billing address?

  - They say that once you submit the form, they will charge your card a 50% deposit that is "not refundable under any circumstance".  Not only is it non-refundable but since they have nothing online about prices except mentioning a $7000 "travel introduction fee", there's no way to know how much that deposit will be.

These three things are enough red flags for me that I wouldn't go any further.