This one, I love but afraid to pitch. People would know I'm a perv...

It's a fantasy world. All of the rulers are females; Queens, Countesses, Duchesses.  You get the idea. Only women are allowed to be knighted and wear full plate mail armor. (Armor that really covers them up) The eldest daughters inherit their mother's lands and titles.

[hider=The Knights would wear armor like this]
[img]https://s-media-cache-ak0.pinimg.com/736x/01/c5/a0/01c5a03d094a693bca84f73ef29ac11a.jpg[/img] [img]https://s-media-cache-ak0.pinimg.com/736x/29/dd/2a/29dd2a38df9951d51880418dff897446.jpg[/img]
[/hider]
[hider=And NOT like this]
[img]https://image.shutterstock.com/z/stock-photo-fantasy-female-warrior-with-sword-and-armor-122522686.jpg[/img]
[/hider]
The males serve as guards and soldiers in the various armies. However, so that the men don't rebel against their Ladies, the men are not allowed to wear much armor. (Think half dressed gladiators). Don't even get me started how little male mages would wear... The sons of the Noble Ladies serve as captains and generals in the armies and leaders of the male guards.  

The game would be played as a "normal D&D type game", only in this campaign world.