I read the first of what I think was a trilogy back in the 1980s, as a child. It was about a man, set fairly far in the future. He was travelling on a large spaceship. He had one companion, a female alien. She had a much lower body temperature, and lived in a much colder climate. They had a sexual relationship (although that was a minor plot point).
The man could interface with the ship and most any sort of computer. As an example, he could "see" through the ship's sensors. I seem to remember a scene where he takes a computerized test and finishes what is supposed to be a several hours-long test in ten minutes.
I'd like to revisit the story and a) see how it holds up to my memories, and b) finish it.
Thanks much in advance for any sort of help!