In my people watching over the years, I have noticed, many groups of women traveling together...some with a girls cruise, leaving hubbys at home, and, single women too, going solo,and enjoying it.
Not sure I ever saw a bunch of men traveling together, leaving the wives home
Lots of single guys going solo...never once thought it odd,or off putting.
Maybe now with the Epic,and solo cabins,and better pricing, more will consider it.