A colleague of mine who runs a very large adult domain name portfolio sent this MRTG slide of same, illustrating a slightly different pattern for his adult traffic.. Notice the strong Fridays and large numbers of people looking for mature content on the weekends. This traffic doesn't swoon as much on non-working days and doesn't spike as high mid-week. Naughty pictures are bandwidth intensive so he's using more through-put as well.
This gent points out that Sundays are stronger than Saturdays at the moment, but most of his visitors are male, so that will change when football season kicks in :) Superbowl Sunday is one of the slowest days of the year.
Fascinating stuff watching patterns of human behavior play out across millions of visits, to hundreds of thousands of small websites. There's so much you can do with domain names. Pretty cool.