Lets not get ahead of ourselves here.
Man flu and Normal flu are 2 completely differant things, normal flu everybody can catch - its a slight discomfort.
Man flu however is differant, only male humans can catch it and it renders them helpless and unable to go to work whilst only being able to watch tv or play video games. Strange as it is, this certain variation of virus does not however prevent the human male from attending the pub and this act could also be viewed as "good theropy", like a sick dog eats grass to be sick and remove the infection.... a male human does the same, goes to the pub, gets hammered on beer (maybe even eats a curry).
After a week of self medication a responcable male can therefore justify going back to work without infecting the office with the severe illness he has had to fight.
...and can be proud he has done his part to prevent the spead of the virus.