As we are the only species with understanding of our consequences
Depends how far you wish to push that, there's a lot of species who understand that if they do something something else will happen. Though we might be the only ones able to see that what happens might not be good for the community as a whole.
Did you know that groupings of young male dolphins regularly chase a female until exhaustion and then rape their quarry?
Yup, I have it on good (non-internet, marine biologist) authority that this is true.
I also have it on good (the same) authority that some experiments performed to see how crabs learned found that 2 crabs in a tank started off fighting each other for food, but then realised that they got fed more often by the researchers if they took the food, chopped it in two and shared it. Not that thats related to sex.
Anyway since animals dont communicate with speach
Define speech? Assuming you just mean a set of noises with a fixed meaning (repeatable noises that mean the same thing, rather than a human language like English) then that's a pile of tosh.