Kojima always had a... Weird relationship to female characters in his games. Quiet and the B&B are some of his low points in this regard.
What happens is that he usually offsets this with good writing, interesting points of view about both the topics of the game and the topic of gaming itself, and a lot of qualities Michael Bay proudly lacks.
But the "pornographic sensibility" is definetly there, and it is a sign of his devolution in a way. You start with MGS that has Meryl naturalistic in panties and some bikini shots here and there as visual gags, then you go on to Fortune and Vamp as more sexualized characters, to Eva as a bond girl whose cleavage is almost a character trait, to the B&B and sex toys with a backstory tackled on to, finally, Quiet who is a sex toy with a scifi justification tackled on.
There are other women in the series, but that is how I see the progress of "Kojima and sex" anyway. It starts with Meryl doing pantless exercises in bed on a kind of voyeuristic scene (that can be easily missed) that is barely sexual to a Quiet in a bikini on literally pornographic shots.
These days, I see most of metal gear through the lense of the (admitedly cliché) point of view of an artist trapped by an industry, almost forced to relive his one really succesful work because that's where the money is. His treatment of sex feels like detachment. He used to care about these female characters enough to, well, treat them like actual characters. As time goes by and his fatigue with this series increases, he just doesn't care anymore. Female characters are thrown in there like the visual gag of the poster of a Model on the locker door, like nanomachines and MGS3 characters were thrown in there to give answers about everything, like he apparently couldn't be bothered to create a story about men becoming demons and the descent of a war hero into a war lord.
It's funny that those games have so much detail and big part of them oozes with love, but then there are parts, like Quiet, that feels like a ceeator just giving up.