As someone who doesn’t want children, when I started my MA I thought I wouldn’t have to worry about the career setbacks women often experience when juggling work and home life. I was wrong. The two body problem is enough all by itself to put me off pursuing a career in Philosolophy. In the time it has taken me to complete my MA, I have seen 5 male staff members (at all stages of career advancement) join and/or leave the department, moving internationally or interstate, with female partners in tow. Not a single female has been hired by the department or moved on elsewhere for the sake of their career.
Of the female staff members whose stories I know (who have been there the whole time I have), one has spent significant amounts of time apart from her husband in order for them to both pursue their careers, and the other has a relationship in which both parties have made concessions and turned down good jobs in order to always be in the same place (it has worked out pretty well for them, but it could easily not have).
The message: men can take all the job opportunities they want, partnered or not. Women have to choose between living with a partner and career advancement.