These guys are right about it being hard these days to be a successful profiting webmaster but, don't let anyone's opinion stop you from trying for yourself. Everyone success story's differ and everyone prospers better then others. You need to find your spot in this over saturated industry and find out what works for you.
Here is a site that offers a WP script:
AdultSiteCMS maybe someone can comment on this, I haven't tried it myself but it does look interesting. Hiring a designer may put a big dent in the pocket, adult design seems to be more expensive then others.
Blogs are a great tool to get yourself started, also get some backlinks on higher PR sites that are in your niche. It is a slow painful process but once you get over that hump it will be a "little bit" easier.
Good luck!