Okay let's talk about some anal facts
(1) It is unnatural
False, Anal sex is an acceptable form of sexual intercourse in some places. Both gay and straight couples find pleasure in anal sex. Though not for every couple, it could be a way to "spice things up in the bedroom" and find other pleasurable sexual positions. The famous Khajurao temples have beautiful sculptures of anal sex being depicted.
(2) It is Painful
Anal sex doesn't have to hurt. Many woman and men find it incredibly pleasurable and some even report having orgasms during it. If you and your partner start slow, the pain will be less. Using a lubricated condom or lube will make it easier for penetration. Many times it hurts because the person receiving the anal sex is tense and tightening up the hole. If you relax then the muscles around your rectum will be more capable of receiving an object or penis inside of it. Stimulating the clitoris at the same time can encourage pleasure over pain responses. If it hurts the first time, it is because it is something new and should be tried again.
(3) I cannot get pregnant having anal sex
The anuses and vaginas are neighbors and if semen slips out the butt and migrates to the vaginal opening, pregnancy can happen. What people should be more worried about is the spread of STD's. Because the anal tissue is so delicate it is the riskiest for sexual activities. It can cause tears and irritation which makes it easier for STD's to enter the body Some common examples are chlamydia, gonorrhea, infectious hepatitis, and HIV). The dry friction that can be caused by anal sex allows these diseases to be more easily spread.
TL;DR: If done right, anal sex could be another way to strengthen one's sex life and bring pleasure to both parties. You should start with smaller objects such as fingers and gradually increase to larger ones and eventually a penis. Lube is essential to reduce friction and make an experience more pleasurable. Lastly, one should still use a condom during anal sex because though there is a reduced likelihood of getting one pregnant, it is still possible AND it slightly decreases the potential of acquiring / spreading a sexual disease.
A good book to read if Don't Put it in There!: And 69 other sex myths debunked by Dr. Aaron E. Carroll & Dr. Rachel Vreeman. There are also several youtube videos and websites links that debunk sexual myths including anal.