I expect it's because you used the term "personal hygiene," implying that not shaving was unhygienic.
To be honest, I shave myself and expect my woman to as well. It is a courtesy thing ( and a visible indicator that the other person at least pays attention down there) when expecting to give or receive oral.
Being shaven implies attention to hygiene and being completely unshaven implies the opposite. Either does not prove or disprove, but I digress. Being cleanly shaven isn't necessary for the impression, but some trimming works as well.
When talking about porn preference, I prefer completely shaven especially from the clit down. It is an aesthetic thing for me and also kind of is affected by my views on some attention down there indicating hygiene.
As for VN porn, there are a very, and I mean a very, small subset of these VNs that actually can do pubic hair some kind of justice. So I prefer the simpler alternative for it to be clean shaven in these games.