I'm skeptical of the whole concept, but maybe I'm just ignorant.
It seems to me that there are always those people who seem to make it look easy to get laid without any serious attachments, and to some other people, this seems to have all the "romance" of "mutual masturbation." On the other hand, there are those people who trip over their own tongues trying to say: "hi," to someone they feel attracted to, let alone: "You want to hook up?" The sex instinct is in all of us. To what extent we are drawn by it to actually try and get laid is a mystery.
I think it is actually telling that the people whose type that identifies with this the most is probably the more private of all the NT types. They don't like their personal space invaded, they don't much like other peoples' personal drama, and they don't like to feel beholden to anyone but themselves. It is almost as if a serious, intimate, sexual, relationship, is such a huge distraction, that it had better be damn good if they're going to invest their resources (self, time, etc.) in it.