I know a lot of women love men in uniforms so maybe try something like a police man uniform and do a little role play
Massages also work really well too!
I hope it goes well!
Honestly the best thing to do is have communication between each other, and see what she wants cause everyone will tell what they like but it might not be what she likes.
Sexy is all about CONFIDENCE.
But some practical advice might include ridiculously simple, even slightly cliche things like candle light dinners, neck and foot rubs, drawing her a bath… Mmmm.
As a woman, I can say that at least during sex, going down and switching to new positions works wonders.
Otherwise, you can do what so many people here suggested: something mundane but unexpected. A random romantic dinner, or even cleaning the dishes when it wasn’t expected can be sexy.
However, if you need something on the fly, massages or some sweet/sexy words in a hushed voice can really work a girl up. Tell her what you wanna do to her, or what you want her to do to you!
Good luck, man!
Talk about it. The more you talk about sex with each other. The more open a topic it becomes. And you two would be comfortable to tell each other what you want or not. Comfort is important for any further adventures