I'm going to actually take a stab at this 1-10 thing, because it looks like we're mostly pretty bad at assigning values on a bounded linear scale.
Zero is consensual anything, the control value. The low end, a 1, we'll say as misreading signals and advancing a kiss on an unwilling recipient. Awkward, but an honest mistake and in the end no real harm done.
A 10, so we're firm on this, would be abduction-rape-dismemberment-murder of a child. If we establish this as our 10, I think the drunken fondling of an unconscious friend is comparably pretty tame, hardly as extreme as an 8.
So lets work down from here. At 9 we have drug raping an adult (9.5 is probably where drug-rape-murder of a non-child sits, and anything else relating to children is in the 9 to 10 range.) 8 would be assault rape of a stranger (the only reason drug rape is higher is because, while assault rape is cruel and animalistic, drug rape requires conscientious forethought on the part of the offender. Since apparently most rape is committed by someone known to the victim, straight up date rape is still a 9.)
At a 7 there's the "rape of passion," ("no means no" but maybe you were too drunk to hear her or between the both of you there was enough inebriation that communication didn't quite get conveyed. 7 is around the point where there might be some level of mutual attraction, but sex was explicitly not on agenda, and sex happened anyway. Also at 7 is not informing your partner of STDs, even if they consent to sex.) At a 6 we're moving out of the clearly-it-was-rape category and down into regrettable sexual activity, like maybe y'all was drunk and she didn't say no but maybe wasn't quite on the page to say yes, or like, should have used a condom and somehow that step was left out and one of the the people involved was not cool after the fact.
At a 5 we drop out of the having sex entirely stage and start picking up non-consensual activities that are not strictly intercourse. This is the kind of thing that gets reasonably traumatizing but doesn't pose a physiological risk for long-term damage, while still being intentionally malicious. Here we've got stuff like breaking into a bathroom while someone is showering (this actually happened at my school, needless to say, the kid was expelled,) circulating photos that were not meant to be circulated, or unsolicited genital contact (either in presenting one's own, or aggressively engaging someone else's.) Down at 4 is where we would start to see non-malicious, unsolicited (or regrettable,) non-intercourse, sexual activity. Here is where I would put things like a couple of drunk kids making out etc who would never consider it otherwise, pantsing someone in a situation where it's obviously not in good fun and they clearly feel violated about it later, or flashing one's junk at a non-appreciative party. Things that might be run of the mill in some crazy situations, but given particular circumstance are not cool with someone involved.
3 gets down to advances in good faith that are more severe then kissing, but nonetheless considered a violation by the recipient. Unwanted groping, sending of explicit photos that the recipient doesn't want, perhaps engaging in some activity in public that one member of exchange is cool with in private but is totally not down to in public. Also under three are malicious advances that do not involve physical contact or aggressive invasion of privacy, things like non-invasive voyeurism (if you can be seen changing in your window from the street, there is definitely a degree to which it is your fault for not covering the window... I think there are even some absurd cases where people have been prosecuted for indecent exposure in their own homes because they were visible from public property,) or infrequent verbal or textual harassment without any physical contact (this kind of stuff can get pretty severe even with out contact, and probably gets up into the 7+ range when you have straight up stalking and considerable fear for personal safety.)
Finally 2 gets down to things like ogling a lady's ass, or the kind of schoolyard dares where you run up and kiss someone who is not pleased with this. Practically harmless, but unsolicited and obviously not potentially signaled for by the offended party.
So, given an exhaustive listing of scale, where would I place the offense of the initial party in question? 3 to 5, depending on the level of tolerance by the drunk girl, and pending appraisal. She might be actually psychologically injured by it, in which case it could go above a 5 merely for severity (some people feel violated if you so much as accidentally bump them, and is their prerogative to do so, though given the circumstances I doubt this is the case.) She might be livid, but more on principle than actual offence, where I would give it a 4. Or she might be like, "dude, ew, I mean, I'm no worse for the wear, but seriously, that's skeezy," which would be all a 3. Or, given my argument in my earlier post, there's always the possibility that she's all, "finally, can we just get to it already?" in which case it wouldn't register. (Also some people are just into stuff like that, which I mean, go them, I guess, and again, if they take no offence then none given, so that would also be a 0.)
