Star Knightess Aura - Corruption increases over time (among other sources). Corruption is used by MC's frenemy to brainwash her from nerdy and virtuous to a vapid selfish bimbo. There are a couple of ways to decrease corruption but never enough to overcome the passive increase, especially on hard mode.
Summer Sweepers - It's a race for MC to hook up with his lady-friends before they get banged by Chad Thudercock and/or MC's futa sister. As well as a hard time limit before you get one of the endings. Sharing and bi/gay routes also available.
Corrupted Saviors - 50 day time limit by default. Either the heroines win, or you kill or capture them for training.
Simply Mindy - hard time limit iirc. Various endings possible.
Naked Ambition - MC is in a succession crisis and has a year to become more popular than her much more qualified brother by building her skills and impressing important people. And/or whoring it up.
Wonder Slave Trainer - didn't play it very far. The gist of it is you have to break Wonder Woman within a time limit.
Degrees of Lewdity - MC owes money and not paying increasingly high amounts each week = forced prostitution and worse. Though it's possible to avoid.