If Bitcoin wants to take off and go mainstream here is 1 thing they must conquer

[gabgab]

porn.

the internet went mainstream only because of porn.

it is the most basic requirement if bitcoins were to have its place in the sun.

[Dobrodav]

Well there  is almost nothing preventing porn sites to accept BTC.
But this is a big "almost" - age verification. Now that achieved through credit cards.
Porn sites can accept BTC, after credit card verification, but in that case, user just not interested in wasting his BTC.

[DATA COMMANDER]

Hell, what we need is for call girls to start accepting Bitcoin. I want to know the BTC/blowjob exchange rate, damnit! 

[gigitrix]

[insert inflation/deflation joke]

[airdata]

You're onto something sir.

Problem is, there are plenty of free sites out there and the vast majority of people use these free sites.