In Excession, one of the characters is considered odd because he's remained male over his long life and hasn't bothered to mix things up a bit. In one of the la

In Excession, one of the characters is considered odd because he's remained male over his long life and hasn't bothered to mix things up a bit. In one of the later books there was a character who wasn't content with that and tried a number of ever-more alien bodies until they found one that gave them the relief they needed.