I don't think this'll ever happen. If they wanted to make a zero-g sex scene, they could use the much more cost effective solution by using NASA's "vomit comet" (or a private analog), like they did in the Apollo 13 movie.
Virgin galactic will only give you about 6 minutes of time of weightlessness, but you will officially be in space with their ship. A plane that gets you zero g costs $5,000, but you only get 30 seconds at a time. But a single flight gets you 15 parabolas, which means 7.5 min of weightlessness with each flight. That is more time than the virgin galactic flight and is a fuckton cheaper. If they were serious about this, they would use the plane method instead.
Zero-g sex is probably awkward as fuck anyway. An erection is hard to get in space, since gravity cannot flow down to your penis, and the humping will push you two apart, making it hard to do anything. I would imagine the only way to have sex in space would be with the woman having her arms and legs wrapped around the man, preventing her from floating away with each thrust.
