Although I will admit, loads of young, cute guys in Hanoi. Never hooked up with anyone there, but if you're into slim Asians with cute faces, then Hanoi has loads of eye candy to look at.
And pale skin. But I like brown skin, Vietnam didn't offer much to me in that aspect. In fact, after spending some days in both Saigon and Hanoi, I can rule out Vietnam as a travel destination for boys.