(World Train Federation) WTF I am sitting next to a hot chick in first class and I cant cuddle up? Whats up with the birth control panels? Thats why I have my BBW ladyfreinds for long train trips..
We have to keep this PG-rated around here...
That said, Singapore Air has been quite firm that they do not allow "knocking boots" in their double-bed suites. The rooms are not soundproofed and the door is partly solid, partly mesh netting. That means anything loud- music, crunching doritos, video games (who plays video games in a $14k/roundtrip suite?) can be heard, too.
The same goes for railroad Sleeper - on my recent CZ trip, I noticed there is a 1" gap below the door which would allow any odd sounds to enter/exit a private cabin, in addition to the velcro shades which do an ok job of sealing off the public's view of your cabin. It's best to keep your train ride PG-rated and use headphones for music or games as well. Whether you drop an extra $200 on Amtrak sleeper or $1000+ on private sleeper, nobody wants to be disturbed or annoyed when they drop that kind of coin.