Twisty's Cash is ok, but conversion rate and earnings, most likely, are not going to be high, or non-existent. The thing with pay sites is, that they dont generate a lot of sales, because everything is easily available for free, especially on the tube sites. To be totally honest, I would say that people search for porn, as someone said, to take care of themselves, and they obviously search for videos, and not pics (as this is better, more "interactive", or whatever you would call it). This is basically how it works. I am not sure about this part, but some people say that comissons from affiliate programs are not 100% legitimate too, but again, I am not sure (either way, there is no way for you to know or check). So in the end, I would say that Twisty's Cash is not going to be making you a lot of money. You may make 1 or 2 sales, in a period of 12 months, with 5-7k uv a month.
I would again recommend to get your own domain and hosting, or use something like
DirtySexBlog, which is safer than Tumblr, as they happen to delete a lot of xxx blogs (they deleted 200 of my blogs, the other day).
And in general, I would think about is as working towards a website like Babes and Stars, Define Babe, or Freeones, if you want to make money. This is not easy at all, you can make millions of websites like this, and you are not going to make $$$. I mean, you could, but this is probably not how it works, I think. You need to have a very good, recognizable website / websites, and be on the top, or towards the top of your niches / niche. Shitty tube websites with duplicate content, or even blogs like yours are more like a waste of time, I would say.