"Drunk" or not, Tasha was the sexual aggressor, and Data was virtually a child when it came to sexual experience. I'd say that nobody was at fault.
Did he keep talking about it?
Clearly not, since he was reluctant to bring it up in his own defense at his trial in "The Measure of a Man", on the basis that he'd given his word.
was under the impression that Picard knew because Data had told him...I was always under the impression that Picard was just that perceptive...and/or possibly Tasha had dropped a hint somewhere behind the scenes that he'd picked up on.