I'm sorry that this has upset you! The nature of the setting is a lot more loose and free regarding sexual activity than is often seen in the current real world day, and the characters of the story have existing dynamics and situations that have nothing to do with Rael. Rael is the lead character of this story, but he's not the centre of the universe. The crew do not exist to revolve around him; the story's not about that.
Regrettably, if you're upset by the members of the crew engaging sexually with one another absent your involvement, Void Dreaming may not be for you. Fortunately, there are many other FVN projects that will no doubt be much more pleasant for you, and I wish you good luck in finding one you enjoy!
I will point out that the other person who responded to your comment was factually incorrect about a number of things. I'm not inclined to go point-counterpoint since I'm certain their tastes and values are colouring their experience to the point where they're actively making up scenarios that never existed in the written text, but when they're going to go ruining people's perceptions of my characters when they're making shit up? I'll step in to at least point that out. Quite irritating.
The ace Rael option was definitely included for those who wanted to consider that option, though. It's always good to see it getting some use!