Hey, if non-monogamous relationships aren't your thing, that's totally fine. Some folks aren't about it. A lot of folks are also, totally comfortable with open relationships, polyamory, etc. Your comment is receiving downvotes for basically being "this is something that I'm not into / that I dislike, therefore it is cringe."
But, I also feel like you might not understand the differences when it comes to "cheating" and monogamy, open relationships, and consent therein. So, I'd like to elaborate:
Firstly, Benneq+Ashe (and a lot of CoffeeSoda characters) engage in a lot of (what would be considered) open-relationship/polyamory activities. This game isn't the only instance of their (consensual) extramarital shenanigans - it's part of their personality and the source material. Also, the last character that fucks him is literally his wife - she's partaking in the overall activity of him getting fucked by a bunch of dudes, and the whole thing is consensual within their relationship dynamic.
You mentioned another game, where someone gets ready for his bf by banging his friends. I imagine that it probably depends on the context. Are they strictly monogamous - i.e., would the bf consider it "cheating?" If it's the game I'm thinking of, then it's understood that his banging with friends is okay and that his bf is canonically VERY huge and so it's part of a process he goes through (and the point of the game) to get stretched out and "ready" for his bf for Valentine's Day. He didn't "cheat" on his bf, unless the context is that it technically was "cheating" to do so. In the case of the game I mentioned, iirc, it's implied that it was okay and normal to do.
When considering open relationships, polyamory, "cheating," and etc., it's important to understand consent and the idea that monogamy isn't totally a binary (black and white) thing. Benneq and Ashe ARE monogamous relationship-wise, but OPEN sexually (so, what would be considered "open relationship"). Some relationships are closed/monogamous in both ways - "strict" monogamy. Polyamory is open on both fronts.
The key to these things is the "contract" that is the agreed-upon nature of the relationship between the involved parties. If it was canonical that Benneq should only fool around with Ashe, as his wife, and this game featured him fooling around with other guys, then yeah, it would be considered "cheating."
However, a lot of the source material around Benneq usually involves him and his wife fooling around with others - sometimes together (most cases that I've seen) and sometimes separately. In all cases, it's a consensual part of their relationship dynamic - they're cool with that. If they weren't cool with that, contractually, then that would be a wholly different thing (and/or kink).
But EVEN THEN, it would still be in poor taste to call it "cringe" - "yucking others' yum," as some may say.
It's all right if you're not into non-consensual non-monogamy (aka cheating), consensual non-monogamy (aka open relationship/polyamory), or even monogamy (aka prude -- I'm kidding! X'D ).
Something along the lines of "hey, non-monogamy ain't my thing, but I at least dig how gay it is" would have been received better and still been in-line with the meaning of your comment. I hope maybe that some of this helps. c: