This just my view on what he meant by 'it's not erotic' at all.
What is his cause for motivation and decision for all shit he's been thru? Sex, tits, and french kiss.
And finally when he met the decision between Makima (his lust) and Power (his buddy), he chose Power. And he's confused because for the first time, decide not based on his sexual urges. Denji's getting his heart back