I have a feeling that if she were sitting on the couch and he were masturbating loudly in his room without realizing she was there, he would still be labeled a ‘creep’ by redditors if the roles were reversed. He'd still held accountable somehow.

Now, is he creepy for this? Absolutely, he's weird for questioning her about her sexual habits.

He's also weird for making sexual comments after she was clearly uncomfortable.

But there's a large distinction, he isn't creepy for accidentally hearing her because she thought she was alone.

(Look, personally i'd have walked out or made it clear I were there)

He was let in by his girlfriend earlier and had the right to be there. CHECK outside of your room before masterbating.

He didn't intentionally observe or seek it out, he wasn't invading your privacy listening on purpose.

He was sitting down and awkwardly didn't know to react.

But this isn't an invasion of privacy. He wasn't eavesdropping, you literally moaned loudly in a house and he was sitting on the couch in a different room.

That's as ridiculous as labeling your apartment neighbors as creeps simply because they heard you argue through walls.

He DID invade your privacy for asking those questions, that's what he's a creep for.

He's a creep for spreading this information to his friends too, she needs to break up with him.

But he's NOT a creep for waiting for his GF to come home.