Nothing stops you from head patting without permission.
Therefore, the act itself isn't lewd, since both parties didn't agree.

Agreement isn't a necessary condition for lewdness

Hand holding in the other hand, require agreement from all the parties involved, therefore, as a pair (or group), they must make an acknowledged decision to do something beyond what's socially acceptable.

As such, hand holding is Lewd.
Or at least, Lewder than head patting.

No

Blow me

Buy me dinner first

Okay.

*buys dinner*

I don't like it

Shit, wait.

*buys better dinner*

50-50

Is that Chestnut?

Foakeh

Y

Well, cooked, they look alike.

you eat these raw.