I always kind of thought Miura wrote that chapter before sitting down and figuring out some of Guts' past. If he knew beforehand I guess that's fine. I just now find it weird that a person that violently opposed to physical contact would be motor boating demon titties, even if it is for hardcore vengeance. Then again a lot of Guts' touch induced rage came from when he was a lot younger as well, so I guess at some point he moved on a bit from that...then again the dude practically had his soul raped by Griffith so he had a lot more emotional torment to deal with at the time post Eclipse.
Miura would also have been more concerned with getting readers on board around that time as well which he's admitted is partly why Guts's sword is so big. That's not really something he has to worry about now.