the shorter saddle for women was so that ample skirts would not get caught on the saddle.
why they are still selling that model is beyond me.
Now as to you and the B17. I never got comfortable on it either - I went right back to my B67 (at the time). If it's hurting your perenial area (I think that's spelled wrong, BTW) the saddle is either not adjusted correctly or it's too small.