Yea exactly.
Its like, Oh wow we are both attractive people and share so many things in common. Of course attraction will come together and a relationship has the chance to manifest.
Or oh the guy is really attractive and the girl is very unattractive, but we both have so much in common and share so many interests. The girl is likely to fall in love w/ the guy. (or vice versa)
Or oh they are both highly unnatractive individuals, yet they have so much in common ect ect. They are bound to just settle w/ each other if they have bad relationships w/ others. (Yea I'll prob get shit for this one haha)
There ya go! You're getting it