Would you give another guy a foot massage?
If you can answer that yes then you are capable of giving non-sexual foot massages. Although it may still be a turn on for the victim.
I believe that in a perfect universe it's possible to give a platonic massage, foot or otherwise. But in my experience it's rare, in fact I don't think I've ever given one without the intent of sleeping with the victim. So I'll just stay very suspicious of anyone who wants to rub my girlfriend's feet.
EDIT:
Sigel said:
MaxTheReaper said:
Sigel said:
-_-
No thank you good sir. I hate having my feet touched especially my toes. I have this irrational fear that someone is going to shove sharp things under my toenails.
I used to have the same thing about my wrists - I had the idea that someone was going to come up when I wasn't looking and slit them open, or something.
This was before the whole emo fad came along, too.
I still have that fear but with my throat( being slit open from behind).

My hair is so long now because of it.
My last girlfriend had the same thing about her neck. One night we were out drinking and my brother went to tap her on the shoulder to get her attention and missed, instead tapping her neck. She span round and elbowed him in the chest then punched him in the face, knocking him on his arse before he could react, and he's no slouch in a fight. It was hilarious and she apologised profusely as soon as she finished reacting.
But she didn't even trust me to touch her neck, made the sexy times a very risky and careful process. It's interesting to see she wasn't the only one who had this condition/insanity.