Men find their way into ballet in various ways. The history of ballet records many cases in which men got into it only because they were pushed into it. This happened to George Balanchine, who was accepted by the Imperial School when his sister went to audition and who hated it so much that he ran away and had to be sent back. Edward Villella was also pushed into ballet because of his sister, and he hated it, too. But ultimately both Balanchine and Villella were seduced by the art.
Some men also go into ballet for the sake of the exercise.
It is splendid exercise, perhaps the very best. Many men have also found that ballet training improves their performance as athletes. And some men seem somehow just to blunder into it by a lucky chance and become addicted. This is what happened with me, and I've run into a surprising number of other men to whom the same thing happened. I know another electrical engineer who got into ballet at his girl's prompting and who has told me he would take classes seven days a week if he could manage it.