Not sure what you mean - I have been touched by male and female colleagues numerous times. Not once was it sexual, it was just people being people. Are you suggesting that they ask my permission every time before touching my arm or shoulder or slapping me on the back?

Can you imagine the following scene:

"Gee John, you did a great job there, I would like to shake your hand, or even pat your back (only near the shoulder mind you and no lower than a line formed by the bottom of your shoulder blades). Do you think that would be permissible? I want to reassure you that this touch will not be sexual in any way."