Michael Bracken 
Old MacDonald Had a Farm [PDF ebook] 

In the near future, clones are raised for the purpose of providing body parts to the ill and ailing. Tom, an administrator, and Sandra, a harvester, become lovers while working in a jungle facility, and the heat they generate in the bedroom takes their minds off their jobs. When Sandra learns she’s about to be laid off, Tom finds out the real reason she’s working there… but can he find a way to help? This erotic short story is masterfully narrated by best-selling voice actor Richard Dickins.