Well, I figure, that has something to do with vulnerability and emotional attachment. A personality that has a disdain for others being reliant, or weak willed. Most often times, I've seen people who have thought like that.
Like first off, we are all human, we all Express the same shit with the same intensity, it just displaced. So where one person can be open and Express that. Another person can not be open in that way, have a distaste for how its expressed.
But is very passionate when if comes to moments of private intimacy. That passionate attitude not expressed in other forms so readily leads to a very active, active as in open minded sex life. Where those emotions and shit are expressed with the same intensity as it would be from the other person.
That or that person is a complete bitch top to bottom. which would lead to repressed sexual needs, and that leads to super conservative sex.