Push The Button wrote:
Helen Noel, crawling through the air ducts in "Dagger of the Mind"
Later there is the fight scene where Noel on the floor pulls her knees to her chest to kick her opponent into a electrically panel, admittedly she is wearing "granny panties," but it's basically a crotch shot and is erotic in it's own way.
What about Janeway pretending to be a hooker in "Resistance"?
Ensign Ro pretending to be a hooker in a bar who is trying to engage Picard is much more, especially if you watch the scene with the sound turned off.
Try it sometime.