Thank you Almighty Mat, that pretty much summed up what I was going to say as my reply (except probably more coherantly then I would've done!)
Rape is a grotty thing, and we don't enjoy it as comic entertainment ('comic' the magazine, not 'comic' har har), where as Sl?ine stories have always been about OTT violence.
Ukko himself, while telling the story of The Horned God, argued with Nest that all the readers were interested in was "lots of hacking and slaying" and I reckon that's true. He didn't say "hacking and raping" now, did he?
P.S. Also note that I said "been better to 'just' have her brutally tortured" - the just in inverted commas, implying a certain ammount of sarcasm. So yes, I kinda was taking the mick a bit.