I think there are different things going on here that are linked but not the same issue.
Kids at a party getting drunk is not ideal, but it happens, and I think that some of the stories are about situations where both parties have behaved regrettably and wake up with dim recollections. Accusations can start flying if one party is getting comments from friends, or parents find out. In these cases, I would say that alcohol education is the way forward. I don't think I would ban it altogether, as I think people need to learn how to handle it in a safe environment. If the first time they drink too much is somewhere unsupervised, then problems are more likely to arise. I'm not sure that in these circumstances labelling a 14 year old a sex offender is helpful.
The situations that are being reported as happening in schools are a different matter. Presumably everyone involved is sober, and it seems from the reports that a frightening number of girls are suffering abuse and inappropriate behaviour. In these cases, it is clearly attitudes that need to be changed. Boys need decent role models, who can get across messages about respecting women, understanding boundaries and so on. I also think that children of both sexes should be taught from an early age that they have autonomy over their bodies, and can say no to being tickled, kissed or whatever and expect to be respected. In this case, there should be serious repercussions for offenders, maybe backed up with courses in observing boundaries, self-control, and similar.
Having said that, I think that things are moving in that direction. I saw a video of my (Great) nephew the other day. He was playing with the dog, who was licking him (all good natured). My nephew was laughing at the dog, and then got sick of it and said 'I don't consent to this', at which point my niece moved the dog away and that was that. My point is less about the dog than the fact that at the age of six he knew that he could stop doing something that he no longer wanted to do, and had the vocabulary to express it. If that sort of thing is taught in schools, children will grow up with a lot more agency than our generations had.