Clark was suddenly in danger of being the 'owner' of one slightly rabid Batman with something to prove, and it wasn't because of something he'd done wrong. It was because Bruce had just realized that maybe this wasn't entirely about sadism and masochism and was processing that poorly.

Fortunately for Clark, unfortunately for Bruce ,he wasn't being given a real reason to start 'proving' things. He was being somewhat disarmed by... well Clark having a PhD in Bruce's Bullshit.

He narrowed his eyes very slightly at Clark. "We have sex all the time. Why would the rules be different."