"I find ambition really attractive - if someone's good at something they love doing. I want someone who is driven," he said.
Styles' 1D bandmate Louis Tomlinson also opened up about women, reported Sun Online.
Speaking about his student girlfriend Eleanor Calder, he said, "We trust each other - I spend a lot of time out of the country on tour. But she often flies out. I think the key to a good relationship is being best friends. I spend more time with her and the band than I do with anyone else. She's really great," he said.