When I moved to Saigon in 1999, the usual procedure was to find a boy, often at the gay nights of Samson Disco (now defunct), then go to a short time hotel in the back packers area to get a room for an hour or two. I did have a couple of guys back to my apartment but that was not well thought of by the manager. As far as I know, the short time hotels, which any of the GR guys will know, are strill your best bet in Saigon.

Though it happens less frequently these days, police often made visits to private homes and/or hotels to make sure there was no one who was not registered. Even staying past midnight at the home of a friend or relative required registration with the local plice. That is one reason why some hotels require visitors to leave at 10pm. The other reason is that they don't want to encourage prostitution. But as said, the short time "hourly rate" places should suit one's needs.