Beauty is always in the eye of the beholder though.
Ho Chi Minh City is a very, very busy part of Vietnam.
Actually if you meet a girl who's willing to stay out late, stay at your hotel, and isn't one bit phased by that idea, then you might want to lock your wallet in the safe overnight.
Regardless of the social standing of the girl you're dating, if she's living with her parents there's absolutely no way she's going to spend the night at your hotel.
Firstly she'll be expected to be home by midnight, and no later, secondly many of the better hotels in the city won't allow you to bring a Vietnamese girl back to your room, especially late at night.
You can see the French colonial influences in many of the older parts of the city, which thankfully survived the conflict.
One key point to mention is that sex tourism is not only frowned upon but is illegal here - prostitution is a serious crime, so avoid any of the "easy girls" you might bump into on your travels in and around the city.
With a population of over 9 million people, Ho Chi Minh City is located on the Saigon River, and is a very busy sea port.