I, on 12 April 2012 - 01:36 PM, said:
Because giggling Eunuchs are perceived as less of a threat (both short and long term) than he-man knights in the PC world of Westeros. It's pretty clear that at least part of the "Varys" personality is an act: there are several occasions when he is talking to people (who are usually about to die) and his voice changes to the point where it doesn't sound like the same man.
BTW, I think he's a eunuch. His story about his castration has the ring of truth to me. But at the end of the day the only evidence on the subject we've received is his word, and he's a professional liar.
I agree with you that the giggling, simpering and powdered looks are all part of an act too. This was revealed in the books as well as in the show when he came to Ned Stark repeatedly dressed as the jail guard and speaking less femininely.
I too think Varys is actually a Eunuch but is playing on Westeros beliefs that being a eunuch must make you weak and girlish somehow. Not necessarily homosexual, but definitely not manly either. Robbing a man of his manhood does not necessarily turn him gay or even weak as we later learn with the Unsullied.