On the contrary, I would not find it credible that the restaurant only runs with one customer. There shouldn't be a bunch of them, but the MC isn't the only one.
(or you were talking about non-priced relationships outside the restaurant, and there yes, the girls are certainly single).
Otherwise, yes the developers of these games are obliged to take precautions not to offend certain very sensitive players.
Absolutely.
In the scene, Burke is forced to confess his infidelities to his wife. If he recognizes 3 of them, we can imagine that there are actually many more.
Above all, if he recognizes 3 relationships, that certainly does not mean that he is currently having sex with three students.
He confesses to his wife that since he got married to her, he has had sex with 3 students, that's all.