Citations:misteress

Noun: "(slang) a male partner in an extramarital relationship; a male paramour; a kept man"

 * 2001 — Wise, Wonder…, iUniverse (2001), Writers Club Press (2001), ISBN 059518829X, page 135:
 * He had a long-standing relationship with his married female CEO boss, and in his eyes, had sex for salary. In her eyes, he was a convenient misteress.
 * 2004 — George, Hunters Beware, AuthorHouse (2004), ISBN 1418430773, page 165:
 * The best looking ones will be kept as geisha boys or misteresses as women were.
 * 2005 — Martin Kantor, Together Forever: The Gay Man's Guide To Lifelong Love, Sourcebooks, Inc. (2005), ISBN 9781402203442, page 101:
 * I don't mind if he has a misteress; shopping is more interesting than sex.
 * 2010 — Anita Stienstra, "Medicine meets literature", Illinois Times, 5 August 2010:
 * With the caliber of work found in this year’s journal, I’d say most of its contributors – SIU students, faculty and friends – spend more time with their mistresses and misteresses than spouses. Metaphorically speaking, of course.