To get Pinkie: Collect Ball near Scarecrow. Take it to Mrs Cake to get it wrapped. Place it in Pinkie's room. Scene unlocked next day.
To get Applejack: Go to Twilight's and learn the Rock Smash Spell (Click the open book). Become a unicorn and go down the path to Sweet Apple Acres. Smash the boulder. Go further until you reach Applejack and buck apples until the scene is unlocked.
To get Fluttershy: At night visit her house. You will see her attempting to screw Angel. After the scene, click on the upper part of the screen as it will unlock her.
To get Twilight: Do Applejack's mission first. Collect 50 bits and proceed to the Train Station to buy a ticket. Turn into a pegasus and go to Twilight's house. Speak to Spike and he will take the ticket. Visit Spike again at night to unlock the scene.
To get Rainbow Dash: Become a Pegasus and race her. Win and you unlock her.
To get DJ PON3: Click at the center of the record on her door. Enter her house and click her to unlock it.
To get Trixie: Learn the Shield Breaker A Spell from Twilight's. Visit Trixie at night as a Unicorn to unlock it. EXTRA: Buy and eat a muffin to unlock a shield breaker B and get a different ending scene. Also, dont forget to steal her book before giving her a 'rude' awakening.
To get Zeco... Chrysalis: Go to Everfree woods. Proceed right, down, down, left, right, left, right to find Zecora's hut. Enter and talk to Zecora to unlock.
Pretty much it for now. Except you can get all but the last scene at the Spa. If you are willing to fork up a total of 160 bits. The 100 one is worth it though, nice blowjob action.
SO much fellatio in this game. Mmmm.... I think I'm gonna have to um...spend some me-time in my mech. :3