In my ongoing save, the social skills and dates no longer reset daily, and are permanently disabled. I spent quite a great deal of time in this save and really don't wish to start over. 

Whenever I enter the Date screen, the game console gets spammed with:

SCRIPT ERROR: update_description: Invalid get index 'sex_times' (on base: 'Dictionary').                                          At: res://gui_modules/Mansion/Scripts/MansionSlaveListModule.gd:231       

And I also get this one randomly when advancing time in the character list:

SCRIPT ERROR: advance_day: Invalid get index 'sex_times' (on base: 'Dictionary').

          At: res://gui_modules/Universal/Scripts/ClockModule.gd:146

In addition to that, the social skills never reset and are permanently at 0 uses for the day. Due to this bug, my save is essentially softlocked as I can no longer perform social skills on my slaves/hires, or train/fuck them.

The save was first created on 0.5.0d.

Either your save is corrupted or you made a bad edit in it yourself. sex_times is the variable in your save telling the game how many times you've completed the Bedroom Endurance Upgrade. It's stored in a nested table at: game_res > upgrades > sex_times. It should be set to an integer value between 0 and 3 I believe.

You can use Notepad++ with JSON viewer to quickly navigate and edit the game's save files (which are stored in ::User/Appdata/Roaming/Strive 2).

I had an edited save, though I had only edited character stats and features and this problem came about. Looking at my saves the section for sex times and a couple other things were just missing. Create a new game and immediately save it, then using text editors to copy over that section (then putting in the values to where I was) fixes it.

I never edited the save, but I did use cheats at some point to add cash.