However cheesy it may sound. i think that all people in this forum i mean everyone.. is positive.. and very friendly.
What comes in my head is people over here range from slightly happy to extremely happy..
I guess it has to do with people generally being good hearted inside, helping each other out..
I think majority of us humans are also satisfied when we get attention from the opposite sex.
Yeah u know the theory:
Everything that people do,
is somewhat or closely associated with being successful with the opposite sex.
For guys(few common desires):
Get money, grow muscle, drive fast car, etc to attract opposite sex.
For women(few common desires):
Makeup, weight loss, dress provocatively, always look good. to defeat competition to attract opposite sex 
so when pheromones help in this.. it may be self-fulfilling prophecy, because.
Pheromones do work, and cause smiles, and because we smile, our biochemistry includes biochemicals associated with happiness thereby really help us smile more.
haha dont u think so guys?