People get planning consent from a distant official planning department or give consent to a medical procedure they would rather avoid.
There is a world of difference between consenting to something and saying 'Ooh, yes, that is exactly what I want!!!' with a big grin and happy body language.
So that is what freaks me out when the word 'consent' is used in relation to anything to do with relationships. It rings big, clanging alarm bells.