What a strange concept - have a couple of Korean actors explore the erotic/adult-theme industry in Japan and make it into a fun comedic show. In other words, put a good face to the AV and sex industry and ignore all the exploitation and downside.
The adult toys are pretty standard stuff, so let's look at the porn and escort industries instead.
While the honesty expressed by the AV actors are appreciated, it was still clearly an exercise in publicity and an obvious attempt to put a good face to an industry better known for using hundreds of young women then spitting them out every year.
Similarly, host and hostess clubs are merely a segment of the prostitution industry. And it's meant to be a respectable or acceptable front. The series completely ignores the darker side, such as enjo kosai (compensated dating).
But it's all still pretty seedy.
The last episode - dating, sex, and love life - was probably the most interesting of all. And it's no coincidence that it was also the least problematic. It's actually an important topic in Japan, and I'm glad that at least the series covered it.
Otherwise, this series feels more like a long and dishonest commercial for Japan's sex industry than an honest look, even if comedic, at what it really is.