[Propertarian]

I'll do a little bit of "science" part:

A) While people believe that "true compatibility" is very rare, most people who describe that they have met someone that is compatible with them will meet several people that they believe they are "compatible" with throughout their lives.

B) Most relationships that are considered excellent by the participants prior to year four are viewed as considerably less excellent after year four (on the rare occasions that they still exist).

C) Obviously what STD it is is important. If it's treatable or minor...