Oh, okay. Touching strange men's bellies & fondling their shirts is okay though? Am just very surprised!
Yes. Vietnamese men fondle foreign mens (protruding) stomachs all the time. Also if you are wearing gold jewellery they will rub it to attract some of your luck away from you.
I have lost a lot of weight over the last 18 months so it doesn't happen to me so much now, but it used to happen to me on an almost daily basis. Some stranger would sidle up to me and start stroking my stomach. Anonymous hands used to do it in crowded lifts and people would walk by and touch me in supermarkets and other public places.
It used to piss me off and occasionally I would be able to grab the hand that was touching me and twist it before the owner could escape.
On one occasion in Q2, I was waiting for my wife in the An Phu apartment block. I was leaning on the balcony railings upstairs, watching for her motorbike to appear, when without any warning I was grabbed from behind by two arms encircling my waist and holding me very tight. I reacted instinctively by swivelling first right and elbowing my attacker in the solar plexus, followed by rapidly swivelling to the left and delivering my left elbow to the same area of his body. There was a gasp and the arms let go as I continued swivelling to the left to face my attacker and deliver a "heel hand" strike to the face of my assailant. This can be a deadly blow if done just right and I stopped just in time as I saw that the person attaching me was a middle aged Vietnamese man who was collapsing as he couldn't breathe from the effects of my two elbow strikes into his midriff.
As he hit the deck gasping for air, a Vietnamese girl of about 15 ran up and shouted in English "why did you hit my father". I said that he had unexpectedly attacked me from behind and she replied "he just wanted to feel your stomach".
Just then my wife arrived and after listening to what happened she told the family (by now Mum and young son had arrived too), that her husband (me) was not a public utility and it was utterly stupid of their father to approach without warning and grab a stranger from behind. By now the man was on his feet again breathing heavily. He collected his family and they departed without a word of apology.
More recently I visited a temple near the Cambodian border, with my wife and some neighbours. We had to queue for 20 minutes to get in. Whilst we slowly shuffled forwards, a lady of about 30 years old behind be kept on nudging into me from behind and kept so close as to be touching me most of the time. I stepped back without warning onto her toes but it didn't deter her and she kept on rubbing herself on my back until my wife told he to back off or she would report the woman for harassment. The woman's male companion told my wife that the lady was simply trying to "collect some luck" by touching me.
In the market in Bao Loc, I was approached by a Vietnamese lady market stall holder, herself of pneumatic build, who insisted in touching me, pinching me and slapping me all over - none too gently - until my wife, who is highly educated and normally very diplomatic and having tried unsuccessfully to reason with the woman and get her to desist, told the lady something which contained the Vietnamese words that begin with D. M. M. Which in in Vietnamese is very rude indeed.
So yes, it does happen and not as rarely as people would have you believe.