That's an easy question to answer: There are as many girls using BTC as there are female server administrators as BTC and server administration is seen equally complicated to the main street girl (and guy).

It is a shame that we have so many market places and casinos and stuff but no website that helps making BTC accessible to the mainstream folks that close their ears when they hear "Altcoin" and "Cryptocoin" and "Hashrate" and "Blockchain" and all that things.

What this world needs, is a user oriented website that makes getting and spending BTCs as easy as 1,2,3.