Quite simply put, he's conflicted...feels both pleasure and pain.
ie: It Feels SOOO GOOOD, but Guilt feels SOOO BAD.
So if he "pretends" he's just floating on down de nile...let him be,
He wants the sexual release and relief because it feels good,
and by pretending he's not involved...he feels better than having to
deal with the feelings that are disturbing to him.
As they say "let a sleeping dog lie"...and if "ignorance is Bliss"..
well then I'd pretty much have to say let him lie in Bliss!
Heck we're all reaching for relief in some way or another eh?
And if it feels good it usually is. Ok I'll get off the pulpit now LOL