Daisy had many assets that made her attractive to the men she met.
Physically, she was beautiful and knew how to dress and accessorize and move so as to emphasize her appealing appearance. Any man would be pleased to have the opportunity to enter a social situation with Daisy at his side.
Socially, Daisy was very good at making others feel important and special. When Daisy first sees Nick, she "held my hand for a moment, looking up into my face, promising that there was no one in the world she so much wanted to see." That special ability to direct her complete attention toward the person with whom she was conversing at any given moment was guaranteed to make any man desire her company.
Intellectually, Daisy wasn't academically intelligent, but she knew how to mingle and make small talk, she was ready to appreciate the clever sayings of those around her, she had the temperment that a woman needed to have to be considered desirable as a companion.
There was an excitement in her voice that men who had cared for her found difficult to forget...a promise that she had done gay, exciting things just a while since and that there were gay, exciting things hovering in the next hour.