In a scene with Jack Ruby he enters a bar/strip joint and you see several scantily clad women dancing suggestively.
When JFK is in the pool with interns swimming naked one woman climbs out of pool and the back of her body is seen fully naked (including buttocks).
In once scene JFK skinny dips with two young interns. In the scene, they are seen swimming around naked playing "tag" As Kennedy swims towards an intern, the camera angle shows his lower back closest to his butt, and the side of a woman's breast is seen.
After the above scene, Jackie finds a bra in the pool and comes to the realization that her husband is having sex with the interns.