Carrie Fisher as Princess Leia, Jabba's slave girl. That was the best part of that film.
Salma Hayek's snake dance in "From Dusk Til Dawn". The rest of the movie was terrible.
Maria Conchita Alonso tied to the exercise machine in "The Running Man". The rest of the movie was good, too.
And reaching waaaay back now....
Maureen O'Hara's introduction to Charles Laughton's character at his mansion in the film "Jamaica Inn". She's clothed, but you know what he's looking at.
Jane Seymour bathing beside the stream in that "Sinbad" film. Heck, any scene with Jane Seymour in that harem girl outfit was good.
And, a scene that's been parodied a number of times, Bo Derek running on the beach towards Dudley Moore. The rest of the film is understated comedic genius.