A unifying factor between the different traditions and lineages of Tantra, is that it is feminine in nature. It acknowledges the feminine as the basis from which all the practices spring. Therefore, Tantra is by its nature, the understanding that all phenomenal existence, the universe, or cosmos, that we experience is feminine in nature.
There are Tantrics who deliberately break taboos and social norms and then there are other Tantrics who, by means of their practices and the way that they practice, that to society in general, it may have the appearance of breaking social norms but in fact that is just the manifestation of the progress of their practice.