The Unit by Ninni Holmqvist (2006)

Searching for readalikes for Never Let Me Go by Kazuo Ishiguro, I came across this Swedish novel set in a dystopia where single, childless men and women of a certain age (50 and 60) are sent to 'the unit', a compound where they are studied for scientific research and provide 'donations' for the public. Very interesting and compelling look at a society that values having children above all else.   A fascinating exploration of relationships, considering that the main character's primary romantic relationship in her adult life was with a married man.  Also, there's a beautiful thread about the main character's great love for her dog.  Very unusual, but very well done.