Where did Jesus say:
a) adultery? literal?  Please
http://www.theway.org.uk/Back/34LaVerdiere.pdf 
Mark's Gospel, however, did not intend to issue legal prescriptions so much
as to address a social situation not unlike our own where marriage was seriously
eroded by soaring divorce rates. Such also has been the purpose of conciliar and
papal pronouncements, not so much to provide legal prescriptions as to
challenge our society with the gospel regarding areas such as marriage. In
Mark, Jesus' teaching on marriage and divorce is an integral part of a long unit
on following Christ to the passion-resurrection (8:22--10:52), delivered in the
uncompromising spirit of prophecy, teeming with hyperboles, allowing neither
distinctions nor exceptions. We therefore turn to Mark not for prescriptive
norms but for a prophetic challenge, proclaiming the gospel of Christ's passionresurrection
and applying it to marriage and married life.