My reference blog lists a few - pasted below. The sex ones contain scattered refs to marriage.
Full url to reference blog is here as there are other books with marriage refs scattered among their pages.
http://www.elizabethchadwick.com/Blogs/ ... rence.html
SEX, LOVE AND RELATIONSHIPS
THE MEDIEVAL IDEA OF MARRIAGE By Christopher Brooke. Oxford University Press 1991 ISBN 019285239 6
HISTORY LAID BARE. Love, Sex and Perversity from the Ancient Etruscans to Lawrence of Arabia By Richard Zacks BCA 1995 CN4675
HANDBOOK OF MEDIEVAL SEXUALITY Edited by Vern L. Bullough and James A. Brundage. Garland 1996 ISBN 0815336624
SEXUALITY IN MEDIEVAL EUROPE. Doing unto Others By Ruth Mazo Karras. Routledge 2005. ISBN 9780415289634
LOVE, SEX AND MARRIAGE IN THE MIDDLE AGES. A Sourcebook edited by Conor McCarthy. Routledge 2004 ISBN 0415307465
THE LANGUAGE OF SEX. Five Voices from Northern France around 1200 By John W. Baldwin University of Chicago Press 1994 ISBN 0226036146
THE LOVER'S TONGUE. A MERRY ROMP THROUGH THE LANGUAGE OF LOVE AND SEX. By Mark Morton. Insomniac Press 2003 ISBN 18946663519