Hi Guys,
While planning the trip, I found very little online regarding sex venues. However, I was advised to publish myself on GayRomeo and GayDar as a visitor, that's what I did, and... WOW! I had no idea so many young Asians would find a 55 yo white foreigner attractive. I found myself having to turn down requests for meetings/sessions...
GR turned out to be more useful than GD. During a 17 days trip I had six meetings: 2 from GD, 4 from GR; 1 in Hanoi, 1 in Hue, 4 in Saigon.
[bTW, at the initial stage of searching I looked on GR for escorts and found none. Turned out that moneyboys publish themselves only in the users section. There are many ads, but they are repetitive. I found 2 in Hanoi and 4 in Saigon. None answered emails. Didn't get around to calling them.]
The guys I met were between 21 and 34. None were "out" in VN, and most prefer sex only with foreigners. All were both nice and handsome; I like also the Asian type - thin and smooth. With most I had long conversations and/or dinner. Sex was at least OK, with most - a real BFE.
One downside: per reputation, except for one Chinese-Malaysian all had small dicks; I mean really dwarfish. It was funny for me that my 14 cm was "huge" in their eyes. In fact everything physical I don't like about myself - too white, chest too hairy, only 14 cm, etc. - was great for them. Quite an experience.
So, whoever is traveling to VN - and I recommend doing so because it's a beautiful and interesting and friendly country - there's no need to look for sex-for-pay. Just reach out and be friendly.