I found this site of the Dutch Sexual Reform Society (available translated into English)
http://www.nvsh.nl
I love their description of the "sexual system". I've certainly noticed the existence of such a thing, and agree with them that relationships would be so much better if our thinking were not constrained by this mold.
And for Aspies who may not be aware that such a system exists, the site is also a good opportunity for them to learn about it, whether or not they identify with it or not.
Some of the pages are explicit, and discussion of those would probably best be left to the adult part of the board, but most of the site is "clean", referring to the sociological, political, and historical aspects rather than the details of the acts themselves.