The torture thing is actually a storyline mission you have to take part in hands-on. I would apologize for spoiling something, but it's probably best you're prepared for it.
I agree with everything else you're saying. I don't mind "sexiness" in a video game. It is usually harmless, and not the focal point of the gameplay itself. Even nudity in and of itself is not necessarily a bad thing. It's when the sex/violence gets up close and personal, I worry that the appeal shifts from "This is a fun game to play" to "I love seeing this sort of stuff". GTA fans have long been thrown into the same group, people who play games in which they commit crimes for fun. But it's a matter of why it's fun for them, that is worth addressing. Most of us like the high-speed action, whether it's gunplay or out-running the cops, etc. because everything is happening so fast there's no time to dwell on it. But it would seem certain other activities that have been included are targeting fans who (also) want to make the suffering of a victim of violent crime or the lustful nature of a naked NPC the focal point of attention and mental stimulation. As odd as it sounds, as video games are concerned, I've more interest in mowing down 100 pedestrians on the sidewalk than spinning my wheels on one of them to watch blood spray a la mud from beneath my tires (which, of course, is also something you can do in GTA 5). It's considered one of the impressive details they added in the game, saw it on a video on IGN.