It's not that Zoro's not stupid enough to let himself get seduced... I just don't know if he's even interested in women. Not saying he's gay, I'm just saying Zoro doesn't seem to be interested in any romance at all. Ever.
And as for retarded fruits, I'd have to say Mr. 2's. As cool as he was, the mimic fruit was just stupid, and didn't suit him at all.
And I can't believe some of you said the Gum Gum was stupid. His power is my second favorite, seconded by Smoker's. What I wouldn't give to be able to turn into smoke.