Is it appropriate for my professor to include gender offensive material that is unrelated to the class subject matter in the course notes?
In economics a "sleeping beauty" is a company primed for takeover, often because it is under-valued. Asset valuation is quite a large topic in accounting, since it can have a huge impact on the final total value of the company.

Some authors are of the opinion that the (European) sovereign debt crisis created a mentality shift in accounting. That is, valuation tended towards more conservative methods, and in so doing, accountants created more sleeping beauties than before the crisis.

It is my guess that your professor did not have time to cover this topic in your course. Or perhaps it is used in another course? Why don't you ask him?

If you feel that there is hostile environment against women, then go right ahead and report it. You should not feel guilty in any way.

However, the professor could simply be trying to grab your attention with a small "shock", as asset valuation is considered by many students (that I have met) to be both mundane and boring.

We do not need more political correctness (PC) or micro aggression within higher education. So please ask yourself if he really ment to promote rape, or if you are simply taking this completely out of context. Again, what is stopping you e-mailing him? Write that you you do not see how it is related to the course, and ask for a clarification. His response should give you a clear indication of how to continue.