Should I grab/smack my Girlfriend's butt every now and then?

I've never really done anything like this, but she smacks mine and teases me regularly. She loves being flirty, but can often be elusive in many ways. If you think I should, how do you think it'd be best for me to work it in without getting a right-hook in return? Thanks in advance.
Should I grab/smack my Girlfriend's butt every now and then?
Post Opinion