Sex games used as bets are like humiliating humans indirectly because people will see performances where it is a private thing between men and women. And let's hope it's fake news that just wants to sensationalize or maybe the one who created the idea wants to know how far the response is from readers or even gamblers.
There could have been more stakes than that if sex games were in casinos because people wanted to try something different that had never existed before. This can make their imagination will expand to create new forms of betting.
as some people said here that it is pornography which is real that it is not worth betting on because it violates immoral norms or even has a huge negative impact out there.
sometimes a gambling addict who has been in gambling for a long time feels bored with the types of bets he plays every day and wants to find new sensations as mentioned in the OP article. from this experience gambling addicts also sometimes have a high interest in trying new types of bets maybe until sex wants to be at betting. whereas on the other hand there are still many types of games that are really worth betting on.