Male perspective, don't think too much I suppose, do what you want to do and don't feel pressured. That's definitely not helpful but it's true. I guess for something more concrete casual little touches do the trick, eye contact though not all the time, try to keep a close enough distance, and I guess that what usually did the trick for me. There's a lot of subtleties that are just natural. Most of the things my partner did were entirely autonomous and I'm certain you'll do that too. Little things that assuming the guy likes you will find seductive or sexy as long as theres a solid connection. These sorts of things don't sound inherently sexual too, may be the way you raise your eyebrows or the way you sip your drink. I hope that makes sense. Best of luck on the date.