Although I agree with most that has been said in the topic by the OP, I disagree about the comparison about a real strip club and a software that barely recreates the experience. Is just like comparing real driving to GTA.
"Strippers on your desktop" is indeed descriptive of what the software is about, but it does not limit what the models can or would do besides that. And, in fact, it doesn't.
Totem added the sexual behaviour long ago to the shows. Now, they like it or not, is part of the product. The users are used to it and they will dislike plenty if it is gone or absent. In the "Totem's strip club" a girl open her legs, rubs and at times fingers herself. Is normal, to me, that many people expects to see that when they pay their "entrance" to this club. I don't feel amazed if the habituals boo to mild shows that give less for the same money.
People tend to forget that all this X-rated stuff for VG was originated by the "bottle incident" that halted the natural evolution of VG. Before that all was explicit at top, including fingering and pretended orgasms.
VG became X-Rated the moment the need to produce shows again for VG with the content that was removed, ***** off users for years, and restored later had to be equalized, nominately, to a different product that took the same sexual behaviour, increased, to cater for people looking for hardcore porn. When I said "nominately", I'm agreeing that VG, even with some energic fingering as models like Natali Blond or Marie did, should not be ever considered "X-rated", but the top of the VG sexual behaviour. Not a single model ever again achieved the joyful sexual behaviour of the pre-bottle incident and likely none ever will.
So, explicit and X-rated for VG is just semantics. I think, then, that no matter what a VG model is willing to do, or end up doing after the stripping, the production will not release or allow DBs-style of L5 content on the VG product and so, all the spicy stuff happening in VG can be just labeled as explicit. That way no user will ever expect to see real long masturbation in VG and it can finally be detached from DBs.
Now, full nudity and explicit, I do think can be something users with softer preferences might want to keep specified, cause seems some people just don't like to see sexual behaviour. So I think this tag is needed.