This is a short story (20 pages maybe) that I read in the mid-1980s in a Dutch anthology. The story is most likely translated from an English original.
It is set on a space-port (possibly an floating platform or artificial island at sea) where the main character is waiting to board a shuttle (or space-elevator?) to orbit. He sees a girl he finds interesting and asks her to get married. She agrees. The "marriage" consists of exchanging some sort of digital IDs that allow them later to enjoy simulated sexual experiences as if they were together.
If I remember correctly there is a third-person narrator that gives background information, including on how that "marriage" works. The narrator also explains that both have made many such marriages and will make many more.
People in this future setting are heavily genetically and bio-tech modified for reasons of fashion, life-style and work. Some are hardly recognizable as humans. Normal biological sex wouldn't even be possible or be very unpleasant for many.
The male character is a space pilot and his skin has metal in it (copper IIRC) as protection against harsh radiation. He also has loads of physical upgrades to enable him to operate under heavy G forces. The girl normally lives underwater and has adaptations to breathe underwater.