I'm not familiar with and female design groups, but if you are hiring a developer for example, you could advertise to one of the many female tech/programming groups that exist, while at the same time searching for an equal amount of male candidates. Or he could recruit by going along with his plan at the university, but instead setting a personal goal to reach out to an equal number of males and females, and not just saying "women only, sorry". Work on getting an equal number of applicants, then ignore their gender and only choose them based on their experience/education.