itsukoii

I've heard some artists with a regular male fanbase like to have this kind of gender-exclusive concert just to experience a different vibe, as the male-only ones tend to be"wilder". And also to cater to those fans and have more of them come to their shows, of course, but don't quote me on any of that though.

During men-only lives and women-only lives the set list is different, in women only the band will play soft and ballad songs while in men only they will play heavier and wilder songs like saishuu said.

Before the audience enters  in the concert hall the staff check the ID and do sometimes body searches for be sure will be have only man if it's a men only concert or only women.

As reminiscing2004 mentionned if some bands do men only concert encourage more guys to comeout and feel less shy to attend at their and I think for some bands who do brootal and heavy songs sometimes they can feel tired to  play in front of a 90% female audience

Pretty sure its because Japanese guys are terrified about being the only guy in a sea of girls, so they just won't go to normal concerts. Cooties?