My choice for this poll was Victoria Principal, Pam Ewing from Dallas. Not only was she hot back then, but we also have evidence that she's ticklish. If anyone recalls my post, she was tickled by Patrick Duffy in the 1985 cliffhanger of Dallas, and she did look genuninely ticklish.
I should also point out that in reference to Charlene Tilton, I am of course referring to after she was 18, which was like after the first year of the show.
Mitch