I have no references to Bacon's alleged pattern of lying, but I do know that
there was lots of "race mixing" in 17th and 18th century America. My maternal
line is inundated with free mixed-raced families—the Banks, the Lynums, the
Goins, the Ayers, the Prices.  And all of these families descend from white
indentured servants "fornicating" with men of color, albeit African,
African-American and/or Native American. There are records upon records from
the 17th and 18th century charging white women with "fornicating and bastardy"
with men of color.  In most cases, if they were indentured, their
indenturement was extended, they were given public lashings, and their mulatto
children were bound out to servititude until their 18th or 21st birthdays. 

It does appear that "race-mixing" was common during that period in our
country's history when class seemed to define how relationships were formed
rather than race [which seemed to have escalated as we catapulted into the
pre-Revoluntionary War period].  

And by the turn of the 19th century, the term mulatto was used to describe
anyone who appeared [or was known to be] not exclusively white. Meaning, those
who were European and Native American, European and African, Native American
and African, or anyone who shared any or all of these mixes.

Acceptable racial mixing was certainly common.  Virginia created laws to
prohibit the rights of many of these people [many of whom migrated to Indiana,
Illinois, Kentucky or Ohio for a better quality of freedom].  However I do
feel the term "acceptable" is all relative.