$70 billion is a bullshit made-up number, impossible to quantify or disprove.
According the
CIA world factbook (perhaps not up completely up to date, but good enough). The entire GDP of virtually every African country is less than $70B - it's just not possible that pornography generates more $$$, unless you count the spin off industries like kleenex

and crystal meth labs

.
Oh, and Burg, as far as saying:
Quote:
I could write a small paper on ...
I'd like to see you try!