Doctor's Notes on Proctitis
Proctitis is an inflammation of the anus and/or the lining of the rectum (the last 6 inches of the rectum). Signs and symptoms include pain during bowel movements, soreness in the anal and/or rectal area, involuntary spasms and cramping during bowel movements, bleeding from the anal/rectal tissue, a discharge (pus), small blisters around the anus, anal warts and feeling that you can’t completely empty your bowels.
Sexually transmitted diseases are the most common cause of proctitis. Other causes include infections, chemicals, foreign objects placed in the rectum, trauma in the rectal area, radiation, autoimmune diseases of the colon such as Crohn’s disease and ulcerative colitis and possibly antibiotics.
STD : Symptoms, Testing & List Quiz

Condoms are the best protection from sexually transmitted diseases (STDs).
See AnswerREFERENCE:
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.