Let's be honest - nobody has ever said "the thing I love about her is that she always plays so safe". We're not suggesting you take up bungee jumping but take a little risk now and then - be both risky and risqué. Show that you can be adventurous.
And whilst we're talking about being risqué, show him a little bit of what he wants, whilst staying classy. A skirt that's only six inches long and a top that's split down to your naval leaves nothing to the imagination, and you have to get a man's imagination working overtime if you want to get yourself on his mind. Show just enough skin to get him going, but not enough to give him the full picture. He'll want to work to see the rest!