For a better-phrased example of this rule, see the code of conduct from the OpenSF polyamory conference:

No touching other people without asking! (Or unless you already have that sort of relationship with them.) We really mean it. This means no random hands on knees, shoulders, etc. We know this is California and everyone hugs, but please do that awkward "wanna hug?" gesture before actually hugging. When in doubt about any kind of social or erotic touching, please ASK FIRST. We have attendees who do not like to be touched, and they will like you much better if you respect their personal space.