Keep her jealousy in check. Stay away from flirtatious glances at other women, too-intimate conversations or, heaven forbid, cheating. These behaviors are most likely to incense a Scorpio woman.
Be honest with her. Scorpio women are intuitive and can't stand dishonesty. Maintain her trust and win her loyalty by being up front about what you're thinking. Never lie to her -- she'll be able to tell.
Plan dates that are private and romantic. Scorpios are very discreet, so lay off the public displays of affection. Instead, take her to a restaurant with curtained-off booths or a dimly lit, classy cocktail bar to appeal to her private, alluring sensibility.
Apologize as soon as you realize you've done something to upset or offend her. Scorpio women can be quite wrathful, so avoid defensiveness or argument.