FYI, in 2001, engineering was 90% male and 91% white; child care providers were 97% female and 19% Hispanic.
To meet potential partners in school, take classes in which you interact with your classmates.
To meet a relationship partner at work, work at an occupation with opposite-sex co-workers.
Organize social events outside work, e.g., company picnics or a co-ed softball team. He signs up for community college evening classes in child development. After taking a few classes, he does a part-time internship at a daycare center. And he finds that many of the customers are divorced mothers. E.g., a female daycare worker works with other women.
She signs up at the community college for engineering classes.