We live in societies that simultaneously objectify and denigrate women. Sexualisation of women is the ubiquitous, and it affects the way many men see women as objects rather than people.
This add-on contributes to all these things - while fictional, it reinforces the idea that women are objects with no agency that simply exist.
Gaming is like any other media, and how people are portrayed in it can either challenge or reinforce existing prejudices & attitudes. This add-on reinforces women as submissive objects and that men can ignore issues of consent for their own enjoyment.
You can choose to ignore changes in sexual politics, and you can continue to believe that games are in some way isolated from the rest of culture & society, but in making that choice you commit yourself to an ethical and intellectual cul-de-sac.
I know this is coming off as whataboutism, but what about violent videogames?
It's not that I disagree with you, I very much agree with the basics of what you're saying, but videogames not existing in a vacuum and the idea that videogames can promote real life behavior is both nothing new, yet you only ever see this argument leveraged against sexual games here on GAF where ssh people dress doing the same thing about violent videogames are getting laughed at like jonathan blow.
If people were actually believing in the arguments they were making against sex games they would have to be against overly violet videogames as well, that would be the only logical consequence, as both kinds of games to the very same thing.
Most people ITT aren't doing this and are perfectly fine with violent videogames according to their post histories.
You knew why that is? Because those people didn't thought about pros and cons of these things before coming to a logical conclusion
And instead they had a conclusion of one thing being good and the other being bad, probably just because they grew up with one thing over the other, and are retroactively trying to justify their opinions.