Half way on the flight from HCMC to Hong kong, a 20's good looking girl came and sat in the empty seat next to me, and asked me to help her filling out the landing form. Then she asked if she could walk with me through immigration and pretends she was my girl friend. I was surprised and asked why, she said immigration may refuse to a single girl through. I thought about that for a while and said no....as i wasn't sure if it was a scam. While in HK, a friend told me that immigration some times refuses entry of an unaccompanied single girl on suspicion of being a sex worker. Just want to share my experience.