We are not ducks, or polar bears or guppies or ants. I cannot find advantages in these behaviors for people - I can find serious disadvantages. I made this point before, with regard to salmon and spiders, we can look at these things as well. With regard to rape, people need to consider reproduction carefully, it is something that involves the whole group, yet rape is a potentially reproductive action by an individual that takes no regard for anything except personal momentary wants. This is not something that society needs, and most people have either instinctive repulsion or cultural repulsion for the action, and this repulsion is logically appropriate for us.
Ducks are quite different.
They need to reproduce, they need to reproduce a lot, lots of creatures eat ducks. My personal observation of ducks wouldn't call it rape, some testing seems to be going on, if a drake is good enough to catch a hen, then he is good enough, she doesn't resist copulation once caught. It was advantageous in keeping reproduction down, people could take better care of children if they did not have too many. However, it is not the most energy efficient way to control population. A woman has gone through all the effort to go through pregnancy and delivery, this energy is just wasted to then kill the infant.