The Empress is the ideal woman for a man. She is Venus, Aphrodite, Oshun, Isis. She is both lover to him and mother to his children.
She also represents growth, nurturing and mature, happy female sexuality. So he wants the relationship to grow and be nurtured. As an event, rather than a person, it means a time of sensuality, deep sexuality too, but linked to emotion. He wants a sexual and emotional relationship. And he wants it to grow, definitely.
She differs from the High Priestess, another great female archetype, in that she is open and not mysterious. So this might mean he wants to know where he stands, he doesn't want too much mystery and mysticism - he wants a good earthy relationship. The Empress is the Earth, too
As the female counterpart of the Emperor, she represents stability - but the stability of nature, which is stability in motion: so he doesn't want a stultifying relationship, or necessarily conventional, but he does want some stability and security.