I really appreciate for the comments left above.
I agree that this is kind of a supply demand thing. However, my worry is that would this have misled people who have just stepped into the field of photography.
I have seen new photographers who don't even know the basics of taking photos but so excited and addicted to shooting portraits or models. Some people might also have the idea that shooting pretty model makes one a pro photographer. But the fact is that pretty models always look pretty, well, unless one's skills really cannot make it. And models wearing bikini are always sexy.
Hence instead of following the trend to shoot pretty and sexy girls, I suggest new photographers to really think about what they really want out of photography, and don't get fooled by the pretty model shots came out of their camera.