I disagree, most popular porn sites (e.g. xhamster) are one of the most secure pages on the internet.
Due to hi load portal are written pretty well and with optimization there is a lot of security patches
Also Their income is mostly from adds - so they don't want to scare potential views with malware so they put extra care to protect servers
Imagine that redtube or xhamster is completely blocked by ESET or other av they would loose HUGE chunk of income
this isn't 1994 where porn sites were hosted on some dodgy ru servers
