Yeah I know xkcd is supposed to be edgy and For Mature Adults and it's dealt with lots of sexual topics before, and I know that I as a reader am a Mature Adult who has dealt with lots of sexual topics before, but this still struck me as really gross. Just because it's about sex doesn't mean it has to be that graphic and a lot of people don't want to see the characters in their webcomics doing that. Now we have, it is true, seen a little of this before: In comic 487, which I said at the time was the most graphic we had seen those stick people be. It weirded me out then and it weirds me out now. Perhaps part of the problem is that going for something so explicit doesn't really serve any function except to prove that Randall can make it so explicit. In 487 it was funny, because it led to a punchline that was all about how that level of graphic sex couldn't be sustained; here, it means nothing. That panel could be replaced by another, less disturbing one that still managed to convey the idea "HEY LOOK PEOPLE these guys are in a relationship! check it out!"
Oh what's that, there's other panels in this comic that also suck? Oh ok good to know.
I hate this comic because it's just another one of Randy's boo hoo I will never be happy, no matter what comics. There's a thousand of them (all conveniently catalogued here) and they all suck hugely. It has a terrible emo "well either path I take I will be sad until I am dead, when I will still be sad" message that completely reeks of Very Young Person At The End Of His First Relationship.
This one makes less sense than the rest of those comics though: We realize by the end that the various rows are supposed to be marking their relationship through time, ending in death, but the characters never age (and I'll begrudgingly admit that Randall did this, at least, well in comic 572). So when the graves show up it's very sudden and confusing. I am also annoyed by the fact that the comic starts with the man clearly with one of the women. That's a pretty asymmetrical situation - in other words, choosing between girl A and girl B is very different from choosing to stay with girl A vs leave her for girl B. It's presented as though both potential lives are basically the same, but really I think you'd end up with some differences: Leaving girl A for girl B colors the relationship you would have with girl B. Maybe. In any case, I think it would have been better to start with the first panel having the guy with a vaguely similar relationship to both girls. Not that it wouldn't still be a whiny immature comic. Just one that made a little more sense.
And holy lord, the alt-text. How I despise you. Whoever said that if you just add the o rly owl you will have everything that is wrong with xkcd in one comic is correct. How much more forced nerdery can you have, randall, you make me want to vomit right here.