Euphoria has maybe 30-35 scenes total, about a fifth of them featuring scat (max). Some feature stuff like fainting and gorey stuff as well. There's at least one lovey-dovey sex scene with each girl.
Starless? Starless simply doesn't give a fuck. It has more than 80 (eighty) sex scenes, almost all of them rape (off the top of my head, I recall two -perhaps three or four- consensual sex scenes), it goes much farther with gore and torture, there's (more) electrocution and there's bestiality, the number of scenes with scat and/or enema play probably reach the twenties, maybe thirty scenes have piss play, there's numerous instances of drug use as well. And the average scene goes on for longer.
...You tell me.