Gratuitous nudity is an HBO hallmark. They've been doing it for over 40 years, since the day when HBO was the only channel out there that would show nudity on TV. People have come to expect it.
It's kinda funny about the violence. I have several streaming channels and the only one that ever lags or freezes up is HBO on occasion and when my wife and I were watching HOTD, the picture froze up right on the scene of the dude's bloody nutsack. Wife and I had to stare at the little spinning wheel on TV for way too long.
I will say the Iron Age caesarean scene was pretty gruesome, all the more because the wife in labor didn't know what was happening to her.
She figured out exactly what was going to happen to her which made the scene even more gruesome!
I would say try HBOMax on another device. I have it through Roku, native app on my Bravia GoogleTV OS, and on XBox Series X. Each streaming app looks better on the same TV on different platforms, and has less issues. I watched HOTD on the Roku and the XBox and it looked great. The native app in GoogleTV for HBOMax is terrible and laggy, very aliased and pixelated (same for Netflix). The opposite is true on Amazon Prime, where the GoogleTV native app on the Bravia is much better than Roku.