Sounds true, methinks. I try to remember that!I personally imagine the happiness drop, not as drop about their happiness with their Master , if you have quite a few woman living together, their will be friction within the group - nothing to do with me as the master.
The girls in my 'team' should be real adepts in oral sex after months and months of BJ:s. Unfortunately my empirical research points to an oddity concerning moblows. Their oral skills mean very little there, perhaps nothing at all, during the traditional morning ritual.Of course if they are not sexually skilled, they will lose happiness with the morning BJ , especially if you are dirty or filthy.
Also, however filthy my MC succeeds to get during the day, he seems to be clean and fresh upon waking up (!). Needs must check this - perhaps cleanliness has also fallen under the recent capping spree - but I know from my own earlier experience and have read comments from other, more skilled than me, players about this splendid wonder that has prevailed during earlier game states.
Oh, I (well, my MC) tend(s) to visit Virax Springs baths most days almost religiously. Not so much for being filthy, but to push up the girls happiness. I will drop this stupid act too. Why bother these days, indeed!