Interesting. I don't expect moral perfection from Jefferson, especially since he held slaves.
Do you have a link, or Google keywords? I tried without success.
Re rationalizations, "societal values" can also serve.
His behavior was moral in that regard. He had his own personal wolf by the ears. Let me give you some clues for your own study of the matter, if you want to pursue it.
Father-in-Law
Estate
Creditors
Chattels
Sister-in-Law
Paris
Anti-emancipation laws
As for the sodomy matter, see: http://press-pubs.uchicago.edu/founders/documents/amendVIIIs10.html