it kinda makes me feel sick thinking about this, but since she a) had a "decade-long sexual relationship" with the man, and b) on the pre-wedding night at 19, that means either they were doing it since she was 9 (criminal) or she was cheating on her husband with her dad (just wrong).
I believe she is implying it started when she was 19, and it went on for 10 years after that. But I don't know how much I believe a person who has been as active in the drug community as she was, and did as much drugs as she did. http://www.nj.com/parenting/amber_w...f/2009/09/mackenzie_phillps_on_oprah_can.html