Let's see that was Vol 1, Vol 2, Vol 5, Vol 9, and if you count those you have to count Madoka fighting in her bra and panties in Vol 12, Aya's naked zone out and pantsless Shizuru in Vol 13, or naked mirror Aya this volume no one being raped, murdered or tortured there. Looks pretty consistently spread across the book from the beginning until now (along witht the rape, murder and torture too). So got anymore unfounded theories you want to try?
Like I said, quick glipse of Shizuru without panties doesn't really count as they didn't really show anything. Naked Aya in the rain has been a one-off for quite some time.
On the other hand, we've had: Enma Enmi, Makiko's hand blowing up, Frankie Fu gross-out, Mataza's step-brother, Yorihira losing his eye, Makiko losing her first arm, Shizuru getting beaten to a pulp, Kabuto getting killed, Makiko being tortured, Makiko losing an eye, Maya getting beaten to a pulp.
So the point stands. There has been a lot more blood, gore and violence in the last 4-5 volumes than there's been ecchi. And there's been a lot less ecchi in the last 4-5 volumes than there's been in the Bowling Alley and Past Arc storylines.
Those days there was fanservice. Now all we get is fighting and blood. The plot's still great, though
There has been occasionaly nudity lately, but most of it was NOT in a sexual context.
So, unfounded theories up yours...