Adult sites are difficult to break into, unless you have "Extremely" UNIQUE content.
You can expect a ratio of around 500:1 or even higher, industry standard anymore....
Lots of start up capital would be good too....
Good luck though, anything's possible.
lol i wish conversions were as good as 1:500...now a days its more likely to be 1:5000+.
The traditional pay site wil not work for you if you don't have lots of money to invest, but there are still plenty of ways to make money. However, i will not be disclosing my methods.