What are you talking about? Among the subset of the population who participates in hands-down-pants, roughly zero percent of these interactions begin with one of them asking for permission first. It simply doesn't happen.
I can assure you that my method means I do not rape people and your method means you might. And that's regardless of how many people employ my very reasonable and clear method of determining consent. Has the thought ever occurred to you that the fact that people believe ambiguous signals to be consent may actually CONTRIBUTE to the fact that 1 in 5 women experiences rape in their lifetime?