I also often get messages from Chinese prostitutes on We Chat. I live just down the road from a major university. It has nothing to do with the company people keep. I can just block and delete them if not interested in their service. That is what the op can also do. He is a bit naive. Many sex workers gravitate to universities for obvious reasons, not just in China either. Sure, some of the students also work as hookers. It is an exaggeration to say all Chinese girls are all "whores" however, an over the top statement. Some of them are promiscuous, others are not. Same as any women.