From the linked blog:
Freddie Mercury: No need to explain why Freddie made the finals. Queen's flamboyant frontman was pretty much the gold standard for this look in the Seventies. That growth under his nose would have been the envy of Harry Reems or John Holmes!
Freddie's 'stache in the 70's was pretty much... inexistant?
Half of the people in those pictures dont have a porn moustache. Just a moustache. There is a difference.
URBAN DICTIONARY- Porn Mustache
thick bushy mustache, rounded on the edges, commonly found on pornstars.
Commonly referred to as a porn stache