They are trying to walk the tightrope of being respectable enough so that the banks aren't shamed by doing business with them, and being raunchy enough so they continue to have revenue. The bottom line is that nothing motivates men to spend money like T&A poon.
I think that, believe it or not, our femynist friends decrying how important these income streams are to women have very quickly turned the cultural tide; it's them vs. the goody-too-shoes columnists like the NYT's Nicholas Kristof, who wrote the seminal editorial about how all these porn sites had revenge/oppressed porn with the blessings of the banks.
Here is that seminal editorial:
Why does Canada allow this company to profit off videos of exploitation and assault?
www.nytimes.com