Exactly. Here, the husband is well-endowed (not Marcus-level, but still) and, according to everyone other than Anne, a highly competent lover, which already makes the game unusual. So if there's going to be narrative tension — what does all this fucking around mean for their marriage? — it has to come from elsewhere.
Several times, this story has presented potential sources of tension — Martin, Ryan, Mike, Dre, Emma, Anne's first boss, Anne's new boss, the woman who claims the husband got her pregnant, screwing his coworkers when Anne specifically asked him not to — and yet, at every stage, the player is allowed to just wave them away by saying, "yeah, go ahead and have sex." One could argue that the dev simply doesn't want tension in this story, but that can't be true; he keeps introducing sources of tension, plus relationship tension and failure to correctly navigate their behavior can be game-ending events.
In the end, it's just bad writing. Anne's obviously fucking Martin on a regular basis, Martin took Emma away from the husband the very same way, and yet this is...no big deal anymore? Not even worth arguing about? Emma tries to steal the husband back by outing Anne & Martin, and yet she's obviously still fucking Martin as well. Not worth mentioning? No, let's find another fifteen previously unknown dicks for Anne to enjoy!