Breast to Breast -> Symmetrical Docking

I'm not sure why I changed this in the first place. After watching GaoGaiGar Final, SD describes this situation perfectly. I've updated the aliases and implications and fixed the posts to use this tag.

It looks like the terms have been aliased. Would it be better to have an implication of symmetrical_docking to breast_to_breast and remove the symmetrical_docking tag in cases where breasts are touching but not 'interlocking'?
e.g.:
http://miezaru.donmai.us/post/show/130720
http://miezaru.donmai.us/post/show/127990
http://miezaru.donmai.us/post/show/130228 (borderline)