I haven't been in Brazil long enough but,  as far as I could see,  it's definitely a gay thing being a Madonna fan. 
My oldest brother has lived here his entire life basically(he's born in the US,  like me,  but moved to Brazil at the age of 5),  he's straight and the other day we were chilling and drinking beers,  me,  him and one of his (str8) friends. 
We were listening to music and his friend asked what should he put on next?  I OBVIOUSLY said :Madonna 

He immediately said:"oh,  you're gay?? " 
