Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In Prometheus, Elizabeth Shaw and Charlie Holloway are a couple, in Covenant, Jake Branson and Daniels are a couple, Billy Crudup and Karine Oram are a couple, Tennessee Faris and Maggie Faris are a couple, Ricks and Upworth are a couple, Hallett and Lope are a couple. It is logical to have married couple boarding colony ships as their trip is a no return. I am wondering in the Alien universe, having married couple to go onto the same trip is encouraged officially.
Is it a coincidence that there are many couples boarding ships in Alien?