The Date-Time Continuum

This theory helps prevent men from falling into the trap of making plans in the far future whilst in a relationship with a girl. The general theorem goes - Never make plans with a girl further in the future than the amount of time you've been going out.

Below is and example of the Date-Time Continuum:

As seen above, the plans made into the future does not surpass the duration of the relationship. This theory is proven to work on 86% of males and will help to stabilize your relationship (if that is your intended goal, high five)