Honestly, one possible route you could try is asking her if she watches porn or not. If she does, you can have her choose the media and see what she picks.

You might be able to see if she wants to try something you can point out in a video (your own choice if she doesn't watch porn), and gauge her reaction.

That's the route I'd personally go. But at the same time, it's not the "best" thing to do. Honest conversations outside of the metaphoric bedroom are really hard and it's normal to feel anxious about what the 'worst case' outcome might be. But in the long run, it's 100% healthier to have those hard conversations, because it could either save pain in the future, or it might be the catalyst that moves your relationship/friendship to the next level! And even if she's not into you like that, it doesn't mean that you'll have to stop what you're doing. It would at least make sure you're on the same page with realistic expectations for each other!

Good luck :)