It's a VISUAL NOVEL, which by definition is an interactive media. The whole point is to have choices. Not all games have non-choices or only choices where you pick to pursue an LI or not. Some games have actual meaningful and game altering choices, they have choices to indulge in different fetishes and kinks. By the very definition of the word optional, it very much is INDEED optional. It's no different than choices in choice-based games like all of the tell-tale games. The characters, story, and in some cases the game world itself can be altered and evolve based on those choices. So this is just a very ignorant statement.
It's also not the first time I've seen this opinion echoed on this website, it's so tiring seeing the same nonsense repeatedly.
Also worth mentioning, you're just making massive assumptions. Like assuming it's a brothel, as apposed to let's say, just a sexily themed bar, or a strip club. Assuming that the LI's would be involved in the brothel part of the business even if it is a brothel. Also assuming that by the nature of the optional content, that the LI's would be the ones wanting to work as a prostitute, or stripper, or be shared. I can understand not liking the content, but it's optional for petes sake, just don't choose that option. If it turns out to be a strip club or a brothel, I would assume the LI's aren't working there in the former case. (at least not to begin with)
I enjoy these types of stories way more than your typical, MC comes home to his family, and they all want his dick... along with half of his school/college/neighborhood. We have enough of those. The real problem with this game is the paywalled content. Also the dev's track record is worrisome.