How Does A Chicken Consent To Sex?

According to "a leading Queensland biologist", innocent chickens are being "raped" by bush turkeys, who are growing in number and are taking advantage of the locals :

"Bluntly, that's a form of rape," he said.

"Especially black chickens....(bush turkeys) seem to think 'oh well, these look close enough' and they'll mate with them."

It's a brutal world out there.