Coming from personal experience, it's a wise move to learn as much as possible about personality structures so that one can know as early as possible who is appropriate for them...and who to avoid.
For example, more than we can imagine, there is a good deal of socio and psychopathic tendencies running around out there...whether realized by the person or not.
Some are aware of it and are gifted at hiding it.
.
Most folks who are serious about having a functionally wholesome relationship will seek counseling/therapy when they discover that they lack conflict resolution skills.
Those who refuse counseling/therapy, unless ordered by the courts, are to be avoided.
This is why, IMO, it's important to not let one's gonads make the decisions early on. If we wait long enough most "guest behavior" will drop off and that's when most folks' neurosis (even pathology) will present itself. We're all neurotic at some level, so it's not anything to fear or avoid. Moving into and through our neurosis, learning to not fear vulnerability, learning and actualizing conflict resolution skills, is the path to true intimacy. IMO, of course.
True intimacy is NOT getting naked and doing the double butt shuffle. In fact, that can be a strategy to hide out and avoid true disclosure.
.
In my own life I discovered that I was mistaking vulnerability and Humility for inferiority. So my ego (defendedness) was reticent to be truly open and disclose.
.
OK, I'm done