Uniformly, the science supports anesthetic during prostate biopsies.

See

Does the intrarectal instillation of lidocaine gel before periprostatic
neurovascular bundle block during transrectal ultrasound guided prostate
biopsies improve analgesic efficacy? A prospective, randomized trial.

The answer is "yes."

PubMed ID 17499292

and

Combination of oral tramadol, acetaminophen and 1% lidocaine induced
periprostatic nerve block for pain control during transrectal ultrasound
guided biopsy of the prostate: a prospective, randomized, controlled trial.

PubMed ID 16952635

and

Prospective study comparing two methods of anaesthesia for prostate
biopsies: apex periprostatic nerve block versus intrarectal lidocaine
gel: review of the literature.

PubMed ID 12875938

and

Local anesthesia for ultrasound guided prostate biopsy: a prospective
randomized trial comparing 2 methods.

PubMed ID 11547070

and

The full 23 pages of clinical study reports on the efficacy of
anesthesia during prostate biopsies at

http://tinyurl.com/2pw4hm

Regards,

Steve J