About 坐車, I think it's OK to 一個坐前面一個坐後面, because if 兩個姐妹一齊坐後面, it makes it as if your hubby is the 'see gay'?? No matter what, I would educate my hubby not to be so 'ho yan' when I'm not around.
I also think HK girls are very 'hou cum', some of them are even very 'thick face' and say they don't mind 'mo ming mo fun' and willing to be 3rd person!!! ?-( ?-(