USA vs Germany World Cup Match -- Porn Site Traffic Dips, Except For ...

A giant porn company suffered a seismic loss in business when the U.S. World Cup team triumphantly lost to Germany Thursday ... with a notable gay exception.

The folks over at Bang Bros -- who run sites like Bang Bus, AssParade and TugJobs -- tell TMZ their network of sites took a 33% hit during the big match.

But for some reason ... its gay site, Gay Pawn, saw a rise in traffic ... to the tune of 23%.

Theories in the office:

-- It was a great 2-screen experience
-- The hot soccer players got people hot
-- Someone else controlled the TV set
-- The soccer players got the "curious" more curious
-- All that talk of headers ...

Not that there's anything wrong with any of our theories.