Actually, it was released right as the Hayes Office went into business. For national release, DeMille had to cut the scenes you included as well as a few others, including parts of Claudette Colbert's milk bath scene. Fortunately, the film was preserved and restored to its full 125 minutes in 1994.
The woman being exposed to the "crocodiles" is stripper Sally Rand. Those are actually alligators, crocodiles would be too dangerous to work with. Unfortunately, alligators are native to the Americas (except for one species in a remote part of China) and would not have been available to the Romans.
I can't find a credit for the woman tied to the statue, but I was able to find one for the man in the gorilla costume: Charles Gamora. He had quite a career playing gorillas and other creatures, sort of the Andy Serkis of his day.
And, the Romans didn't know about gorillas either. They were unknown to Europeans until the mid 1800s.