What's the strat to get all the grindy stuff out of the way the quickest?
P.S. Muscle-chan visits every 5 days until you defeat her when she says she might accidentally kill you. You don't have to fight her if you don't go to the dojo on those days, but the first two fights should be winnable without prior training. Fair warning, even at lv 20 str, you'll need to click for your life on the final fight.
Specific unlocks:
If you want to visit their houses at night, gotta sell their sex vids to the shady black market dude until the game stops telling you their relationship is too strong. You can only make sex vids at the dojo.
Movie minigame needs lust items to have a casual chance of succeeding. Buy all that shit before proceeding.
If you want to molest the wife and college girl at the movies, gift their spouse/boyfriend stuff until they max out at lv 5. If you "trained" her that day, she'll appear at the movies in the afternoon. Interacting with them outside the theatre will tell you what movie they're watching.
If you want clerk girl, she should pop up at 4 pm at the movies every day until 10 pm. Visit the construction site at 2 am about 3 or 4 times to unlock her showing up between 12-2.