Firstly: It's Jeph's comic, and as someone who runs a creative business as well I'm going to say about mine - if you want to start and manage something, build it from scratch and be the one making it grow and develop, THEN you can start making the Big Boy Decisions. Until then, shut your yap. And since I take that stance with my business, I'm going to avoid telling Jeph what he should and shouldn't do.
Personally, I'm not offended in the slightest by nudity. I don't think it has a place unless it's supported by the story. If his strip turned into the guest panel a few weeks back that was all about the boobies I personally probably wouldn't continue reading the strip BUT I'd still not be criticizing him or his right to draw whatever the hell he damn well pleases.
There's some comments that characters are "unrecognizable" from their original personas. From a literal standpoint that's semi-true (Jeph's artisitic ability has matured quite a bit and the characters now look MUCH different from the originals), and from the intended meaning of that statement I'd say it's very true.
Like real people, the characters in the strip have changed over time as a result of their experiences. At the strip's beginning, most of the characters barely knew each other and we've been seeing them get to know each other better. Some regulars have been pushed to the back burner, and some less-used characters have become prominent (most notably hanners) - Just like how things frequently happen in real life.
Just because simpsons, family guy and south park don't ever change (seriously, how long are those kids gonna be fourth graders?!?!?) doesn't mean that the QC characters shouldn't. I think I'd actually be more annoyed if they stayed static and you could tune out for a month at a time, come back and have them making the same indie band joke they made as you were leaving. Jeph's story evolves as its told and for the most part, that's a Good Thing. I *KINDA* wish the "cast" page got updated slightly more often just to keep it semi-current - but does it really matter? I visit to read the comic - the cast page just helps people adapt to it quicker.
Getting back to topic: So far, I can't understand why anyone would be offended at the amount of skin shown. Aside from the possibly offensive concept of sven's hands being the thing that's covering them up, there's no more skin shown than what's common on normally, socially acceptable TV - even in the comparatively puritan USA. As far as the sexual nature of things, it's still within PG-13 bounds (and possibly pg even) - and the name *IS* Questionable Content. Ultimately, if you don't like it, don't read it - that would make Jeph either change the style OR decide that he wants to continue doing it his way with a smaller reader base, but I have a feeling that it wouldn't shrink THAT much anyways... I for one am not going to stop reading it unless it just devolves into SexFest 2008 OR if the storylines get too boring and I'm just not interested anymore. And even if that happened and there was a mass exodus, there's a good chance other people who aren't interested in the current format would like the new one and it'd balance out anyways.
In short: Jeph can do what he wants. If you don't like it, find another comic that suits you... there's hundreds of them out there...