I wrote up my own brand of description that focused mostly on the issues that SX 7's have to face, as the user Cosmic Orgasm requested of him, before he was banned from PerC
The sexual 7 is largely that state of discontentment, or rather in which one is not really attracted to much of anything to be specifically, so they create phantasies in order to amuse themselves. It is mostly related to a psychological state of immense boredom, an innate distaste in the common and other such things you heard about. The sexual 7 can be compared to the 4, but unlike the 4 who searches for the originality, the ethological origin of who they are, the sexual 7 is only really immersed in finding unique experiences, and the embrace the totality of such experience in order to quench the dullness to his life. Another comparison would arguably be to the whole entirety of the perception orientation of JCF, mostly dictated by their own whims and wishes. As such, the sexual 7s neurosis is that of the hollowness of novelty, and the unwillingness to deal with reality. Preferring meaningless fantasy of something instead of the whole truth of another person. In this sense, the holy planning is just the infantile rejection of unpleasantness in general, though the SX 7 might in fact be orientated towards the darker aspects of human nature though, this is sexified to the point where the disgusting, embarrassing contents of their own inner darkness has all but been discarded, merely replaced with a more acceptable version. One free of such things as like incestrious feelings, shitting one's own pants and more of a focus on TOTALLY JUSTIFIED revenge fantasies.
Also for some reason I'd think of the self preservation 7 as being less of some sort of business man and more like a prophet of some sort. The one who shows "the right way", through words or actions. She is always right, and knows what exactly to do. It is a fixation on not being wrong. A point that I associated with the SX 7 instead, though that honestly didn't make much sense.