I am a former motorcyclist and there is an unspoken and sometimes spoken rule that you just don't touch people's rides unless you have permission... with familiarity and trust things change and I used to be on the short list of folks that could handle my friend's 25k Honda Goldwing.
Some guys will tell you not to touch their bike, others might be a little more vocal, and there are a few guys that will mess you up.
Similarly... I won't touch someone else's bike and if I found someone feeling up my bike there's be questions like "wtf are you doing" moment.
The last guys who I caught feeling up my bike were in the process of jacking it... the locks baffled their simple minds and the "WTF ARE YOU DOING!" made them back off.
In regard to my girl, who isn't a possession, but someone I love and respect very deeply... copping a feel is going to result in an ass kicking of biblical proportions... if I catch you.
There is a fellow that took certain liberties like this (when I was not about) and fortunately for him... he is on the other side of the continent and if I do run into him I am going to f up this sleazy piece of ****.
If a man does this to one woman I am pretty sure that the list of victims is pretty long.
If there is one thing that flips my tilt switch... this is it.