https://www.teamupturn.com/reports/2016/what-isps-can-see
Even a short series of visited domains from one subscriber can be sensitive. A pivotal moment in a users life, for example, could generate the following log at the users ISP (assuming the user hasnt invested in special privacy tools):
[2015/03/09 18:34:44] abortionfacts.com
[2015/03/09 18:35:23] plannedparenthood.org
[2015/03/09 18:42:29] dcabortionfund.org
[2015/03/09 19:02:12] maps.google.com