I can promise you that the corrupt explorer is definitely beatable, and there's even a few days of doing it.
Stripping and attacking works. Stripping and then using items to stun him are even more effective.
Presenting yourself and using grapple attacks will also work. And Presenting Yourself, letting him get in close, and using Resist! will even do a chunk of HP damage and lower his defenses!
Make sure not to forget about your grapple abilities, especially against lewd foes! If pure weapons and physicality won't work, you've always got that option available to you.