Look Sharp As Hell
Men are invariably described as "visual creatures" and while it's true that most women use a full spectrum of qualifications to determine whether she'll commit, visual appeal factors heavily if she's going to be tempted to indulge in more short-term gratification.
So, yes, dress to be desired. A suit and tie says you're trying to hard, instead, ditch the formality and wear a casual cool ensemble that shows your have some style.
Grooming wise, make sure your scent game is on point. Don't douse yourself in cologne (no matter how good you think it smells), spray just enough that she'll want to get closer for a better whiff. Also, be sure to pay extra attention to your hands, because she will. If you nails are all gnarly and crusty, she's not going to want them on her soft skin.