Yes most adult sites run in plain PHP and recycle 10+ years old code, doing minimal, little updates, mainly to make the ancient pages to display on mobiles. The fact it is, adult it was innovation in 1990's so that's the time and age when most code was done, then it was kept "as is". Certain control panels (some billers.., traffic networks) are so 1990s, definitely you wonder if you're in time machine. Perhaps some cam site (but some not yet support H264 codec in 2013...) are up to date tech, but cam sites are so few, a dozen original (all rest is whitelabels), so not even to be counted, 1% probable you work in a cam site, 99% you work at something else.
To be specific, in adult there's no ruby, node.js, C++11 or even python (just example of what's "hot" for a dev to work with), so no any skilled and up-to-date (or perhaps just young) developer would want to waste his valuable time to fix ancient tgp's or CJ's code, talk via ICQ (!?), even if paid well (which does not happen in adult, except perhaps a few biggest programs, who do not hire since years). It is just a matter the technology is not cool, this is important even more thaqn the money for the skilled dev guy.
Even bitcoin sites (but not mtgox) are more modern technology than adult, most of them. It is more likely a dev work for free bitcoin project, than paid (so so) to edit an ancient standards adult site.
I noticed even fraudsters, carders and such are no more attacking adult sites, but are more into politics, banks and such. Until a few years ago I was getting in sites some very hi-tech hacking, they're all gone to go robber real cash in banks, or steal industrial secrets to real corporations. To hack a porn site it became so lame
