Is possibility to filter searches removed? If so why?

It used to be possible to google on the site so you do not get returns containing [Penectomy], or that all your returns contain [Testicles].

Theme indexes can not substitute for this.

Google doesn't want to have anything to do with us anymore, so I'd say no.

Googling the site still works, it is because it requies login to actually see the stories it is not possible to use it for detailed story lookup.