Hey im a girl and i have a girlfriend and i was wondering what i could do to get her turned on before sex because i don’t really know what to do…

Your gender puts you at an advantage here…

What do YOU like? What turns YOU on? Just apply it to your girlfriend and then start experimenting/tweaking it based on the way she responds. Not everyone likes the same things, of course, but it’s a good starting point!

Kiss her, touch her, grind with her, squeeze her ass, spank her, bite her, pull her hair, play with her breasts (lick, suck, nibble, whatever!), find the spots that make her moan, explore her body and watch/listen to how she reacts. Anything! Just experiment. This is supposed to be fun! Learning is fun! 😉

Explore and pay attention. That’s the best advice I can give you.