The author is creating a platform for one group of people to discuss their common issues. In this case, that the common feature between people in this group is gender.
Other platforms exist for discussion between people with common attributes. An example is cancer survivors. Discussion in a cancer survivor group should probably be limited to cancer survivors. Do you think that people who have not experienced cancer first or second hand would have a good reason to post their problems in that group? I can imagine the posts now - "I haven't had cancer or experienced it in any form but here's how you should deal with chemotherapy." That's probably not appropriate.