Mehta: "The mere fact that adultery is considered unconventional in society does not justify depriving it of privacy protection. The freedom of making choices also encompasses the freedom of making an ‘unpopular’ choice"- in married relationship I can have adulterous relation because that is my private choice, it may be unpopular.

This was articulated by Justice Blackmun in his dissent in Hardwick. There is something more.