Dwan shows cleavage as Kong bathes her and pokes at her clothes. His expression also resembles human-like lustful leering, especially his eyes, though it comes off as cheesy and funny rather than creepy.
Dwan wears a dress that opens up at the front of her legs, and when Kong picks her up, we clearly see her bare legs all the way up (only her crotch is covered). Later, Kong drops her in the water, and we clearly see her bare butt from a distance (implying that she isn't wearing any underwear, or that it is just really skimpy and barely covers her butt). This is clear for a couple of seconds (no frontal nudity is shown).
After Jack rescues Dwan, she goes to hug him and her top falls down because Kong pulled it down and she had hold it up. The side of breast is seen. Jack is then shown bare chested after giving her his shirt.
A woman is taking a shower. Only the silhouette from behind the curtain is seen.
It's mentioned that Kong was trying to "rape" a woman.
Kong pulls down a woman's dress; one of her nipples is very briefly seen.
Natives dance orgiastically before the heroine is presented to Kong. The lead dancer, dressed as Kong, makes many pelvic thrusts in a loincloth, leaving little doubt as to what they assume Kong does with his sacrificial victims.