Pay ahead

The other thing to remember is that rarely is this an actual woman asking you to do this.
It would be SOOOOOOOOO easy to grab some pics off the internet, and open a venmo or whatever and say "I'll fuck for $300, I need $150 now". If you can get one sucker a day you can make a couple of grand a month.
As soon as they ask for money up front - just assume it is a guy that's catfishing you.

Only exceptions are touring girls that are well established that are trying to determine whether Pittsburgh is worth a stop.

I use Google Images & https://tineye.com/ to try to find the images in those "pay in advance" ads. Its amazing how many of these girls had their pics on closed forums like 4Chan and Reddit.

When I find them I like to just send the link to the forum thread (often on vipergirls) and say 'wow why was this picture of you posted to this forum 8 years ago?'
They stop replying afterwards