My favorite positions with a guy are on my back with my feet kicked up (so he's kneeling upright), on my side with one leg up, and bent over at the waist and fucked from behind. I love that feeling of pressing up against somebody. I prefer internal to external play (fingering vs. eating out/rimming). I get off more from being fingered while being eaten out than just dextrous tonguing. What really gets me going is a bit of domination, though.
Magical Emi turn-on formula:
1. Choke me.
2. Look into my eyes.
3. Whisper that I'm going to be a good little slut/fuck toy/plaything/etc.
4. Watch my vulva swell up and get pinker!