I’ve never been to Marseille but I’ve been to Paris many times. It’s never been a great place to punt in my opinion, at least not compared to the UK, and now it’s a whole lot worse due to prostitution being outlawed. My advice would be to tread very carefully and to do a lot of homework and cross-referencing. There are a number of escort sites which contain a mixture of genuine and b&s. As far I know, one of the better ones is
External Link/Members Only I’ll be in Paris for a few days next month and hope to get one punt in. However, I’ll be doing more research than usual in advance to try and cut down on the risk of a disaster.