First, a psychosexual surge is a brief mental event in which one suddenly finds themselves believing the opposite of what they normally believe regarding some sexual matter. For example, one might suddenly find themselves believing sexual pleasure has greater value than God.
Now, the mind has the ability to project a pseudo-psychosexual surge into consciousness. A pseudo-psychosexual surge is an imaginary psychosexual surge.
All of this means:
You can never trust your mind when it tells you that you suddenly believe the opposite of what you normally believe regarding some sexual matter.