No I don't think I do.
Sex is very important in a relationship, for me.
But I don't view that is overvaluing it.
I can go without sex just fine when I'm not in a relationship.
But sex is after all the very culimination of a romantic relation.
One can't get any closer to someone than pulling off ones clothes and being inside someone/having someone inside.

Sx doms have a great insecurity about relations.
They have been scarred by the world and hence will focus excessive efforts on stuff that can help them gain connections.
Every interest is just another jewel or perk to stand out and be appealing to others.
The enneagram type in my opinion is just how this went wrong and to what degree.
The more neurotic one is, the more the Sx-dom will use the issues of ones type to justify screwing up in this area.