His student Naruko's house

Jiraiya was sure of it, his 'sense' was directing him here, a seemingly simple house in the middle of the village.

Seemingly simple because he knew it was his student's house, and covered in Seals to keep it safe and undisturbed.

But he knew something he needed to see was happening here, so he'd get in anyways!

Luckily as he was the one that taught Naruko these Seals it took him less then 30 seconds to slip in without actually disturbing the Seals.

And the moment he slipped in his ears were immediately assaulted with female screams, screams of a woman in the midst of a mind-breaking orgasm.

So of course he followed the noise to Naruko's room and peaked in.