Hello.
I'm not sure what "lining" you're referring to, so am going to assume you're asking whether the anus and/or the rectum can be damaged during anal penetration. The answer is yes. Here's some information about anal
sexBuccal smear
Causes of sexual dysfunction
Child abuse - sexual
Delayed ejaculation
Erection problems
Female sexual dysfunction
Inhibited sexual desire
Orgasmic dysfunction
Puberty and adolescence
Rape
Safe sex .
Many people greatly enjoy anal stimulation—whether with a
tongueTongue tie,
fingerAmputated finger
Amyloidosis on the fingers
Clubbed fingers
Cryoglobulinemia - of the fingers
Finger pain
Herpes zoster (shingles) on the hand and fingers
Janeway lesion on the finger
Kawasaki's disease, peeling of the fingertips
Nail abnormalities
Replantation of digits
Ringworm, tinea manuum on the finger,
penisCancer - penis
Curvature of the penis
Penis care (uncircumcised)
Penis pain or dildo. Your profile states that you’re a woman, but most of the following applies to both sexes.
The keys to anal sex are 1) lots of lube (the anus doesn’t produce its own lubrication), 2) lots of stimulation of the anal area (to relax that tight sphincter) and 3) gentle, slow penetration, not just ramming it in. Be sure you and your partner are communicating during anal sex; tell your partner when you experience pain and when something doesn't feel good so that you can stop or go slower. Start gradually and slowly, first with just a finger, and then if you mutually decide on penis insertion, do that very slowly as well. It’s OK if you discover that you only want to be penetrated by something small, rather than something a bit more “important” like a penis.
Very important: The anus is a very tight orifice, and tears easily, leaving it vulnerable to infection, so BE SURE to use a condom. And don’t put anything in your vagina that has first been in the anus (fingers, toys, penises, etc.) without using a new condom, because the bacteria that live in the anus can be harmful to the vaginal environment, which can cause various unpleasant side effects like yeast infections.
If you’d like more information about anal sex, I highly recommend the book, "Anal Pleasure and Health," by Jack Morin, Ph.D. This is the most authoritative book about anal sex, written by a prominent sexologist. Dr. J