As far as I know usually until you consent to something, you are implicitly not consenting.
Like if I'm eating fries, and you walk up and take some, and I'm like "Hey, I didn't say you could do that" you replying "But you never said I couldn't do that" isn't really a valid argument. The onus shouldn't be on me to explicitly tell every person that approaches me "You can't take any of my fries", the onus is on the person who wants some of my fries to ask me if it's okay. Make sense?
Most of the time, the argument lies within what counts as consent and when it can be given. As well as when consent can be withdrawn after being given. That, however, is a much larger argument that has been hashed out here many times, and is never resolved until either someone is banned for straying into personal attacks or someone blocks the other person.