A three culture Devil's Threesome. The woman is from Europe (preferrably germany). One male from russia and the other one from america. During the act both male participants have to try to surpass the opponent male in endurance and skill. The challenge ist to goad each other so hard that the woman ends up mental and physical destroyed.
A period right after world war II when the soviet union & the united states decided to compete for who can build more dangerous weapons while not fighting each other because they'd definitely use their nukes on each other which would end up in nuclear fallout & the destruction of the entire planet which is why no military is ever allowed to use nukes. They're allowed to keep them though.