The polyamory and BDSM subcultures prove that nerds can create new social rules that improve sex

The modern BDSM culture's origins are somewhat obscure, but I don't think I'd be comfortable saying it was created by nerds despite its present demographics. The leather scene is only one of its cultural poles, but that's generally thought to have grown out of the post-WWII gay biker scene: not the nerdiest of subcultures, to say the least.

I don't know as much about the origins of poly, but I suspect the same would likely be true there.