Most cases of anal cancer are related to infection with the human papilloma virus (HPV). Anal sex alone does not cause anal cancer; the risk of anal cancer through anal sex is attributed to HPV infection, which is often contracted through unprotected anal sex.[75] Anal cancer is relatively rare, and significantly less common than cancer of the colon or rectum (colorectal cancer); the American Cancer Society states that it affects approximately 7,060 people (4,430 in women and 2,630 in men) and results in approximately 880 deaths (550 in women and 330 in men) in the United States, and that, though anal cancer has been on the rise for many years, it is mainly diagnosed in adults, "with an average age being in the early 60s" and it "affects women somewhat more often than men."[75] Though anal cancer is serious, treatment for it is "often very effective" and most anal cancer patients can be cured of the disease; the American Cancer Society adds that "receptive anal intercourse also increases the risk of anal cancer in both men and women, particularly in those younger than the age of 30. Because of this, men who have sex with men have a high risk of this cancer."[75]
If you’ve had unprotected anal sex and are worried about possible HIV infection, go and see your healthcare professional straight away. You may be able to take post-exposure prophylaxis (PEP) to prevent HIV infection, but it has to be taken within 72 hours to be effective. However, PEP is not a replacement for condoms and isn’t available everywhere.  
I think that person was referring to it being dangerous by unnatural orientation. The anus isn’t “meant” to be penetrated and sometimes it can cause injury, especially if the receiver doesn’t take proper hygienic precautions. As usual, first-timers are prone to bleeding just as they would with first-time vaginal sex. This leaves them vulnerable to more bacterial infection than they would be with vaginal sex.
6. Pay attention the butt cheeks too! Just because your ultimate goal is the butthole, doesn’t mean you should totally ghost your partner’s butt cheeks. Sadie Allison, founder of TickleKitty.com and author of Tickle My Tush–Mild-to-Wild Analplay Adventures for Every Booty, recommends starting off with a sensual booty massage. Using lube, “place your thumbs in the creases where the legs meet the butt cheeks and glide your thumbs along the crease from the inner thigh area to the outer side. Lift and repeat. Then, put your palms together in "prayer position," placing them on their tailbone and gliding up and down their buttcrack."
Feast your sight on the most amazing redheads spreading their juicy ass cheeks and biting their lips with lust when taking dicks in those tight holes. Gorgeous blondes and insatiable brunettes are about to get anally lubed and fucked for massive orgasms. Massaged debutantes begging for anal sex with strangers and cuckolding wives taking it up the backdoor while their husbands watch.
In a male receptive partner, being anally penetrated can produce a pleasurable sensation due to the inserted penis rubbing or brushing against the prostate through the anal wall.[4][11] This can result in pleasurable sensations and can lead to an orgasm in some cases.[4][11] Prostate stimulation can produce a deeper orgasm, sometimes described by men as more widespread and intense, longer-lasting, and allowing for greater feelings of ecstasy than orgasm elicited by penile stimulation only.[4][11] The prostate is located next to the rectum and is the larger, more developed male homologue (variation) to the female Skene's glands.[22] It is also typical for a man to not reach orgasm as a receptive partner solely from anal sex.[23][24]
There is less research on anal sexual activity among women who have sex with women compared to couples of other sexual orientations. In 1987, a non-scientific study (Munson) was conducted of more than 100 members of a lesbian social organization in Colorado. When asked what techniques they used in their last ten sexual encounters, lesbians in their 30s were twice as likely as other age groups to engage in anal stimulation (with a finger or dildo).[2] A 2014 study of partnered lesbian women in Canada and the U.S. found that 7% engaged in anal stimulation or penetration at least once a week; about 10% did so monthly and 70% did not at all.[70] Anilingus is also less often practiced among female same-sex couples.[71][72]
^ Jump up to: a b c Kilchevsky A, Vardi Y, Lowenstein L, Gruenwald I (January 2012). "Is the Female G-Spot Truly a Distinct Anatomic Entity?". The Journal of Sexual Medicine. 9 (3): 719–26. doi:10.1111/j.1743-6109.2011.02623.x. PMID 22240236. Lay summary – G-Spot Does Not Exist, 'Without A Doubt,' Say Researchers - The Huffington Post (19 January 2012).
It’s a cardinal rule of sex to never go from anal to vaginal penetration without changing the condom (even if the penetration is with a sex toy). This is because introducing fecal matter into a woman’s vagina – even if it’s her own fecal matter – places her at significant risk for developing a urinary tract infection. Women are at higher risk of getting these infections than men because a woman’s “plumbing” is such that her urethra is quite short, making it very easy for bacteria to climb up the urethra and set up camp in the bladder. In some cases, a bad urinary tract infection can even travel from the bladder to the kidneys, which is very serious.
These are swollen veins in your rectum or anus that can burn and itch. Straining when you poop or pressure during pregnancy can cause them. Sitting in warm water (a sitz bath) for 15 minutes several times a day may help. Try one after you poop. Drink plenty of water daily and get fiber in your diet so stools are softer. Call your doctor if you notice blood or have pain during a bowel movement so he can rule out more serious conditions.
So you want to try anal sex. That's great! Anal play can be lots of fun — if you're ready for it. Unlike other types of sex, which most people can fumble their way through when they don't have much experience, anal sex takes some research. (And, to be clear, it's always better to think and talk through any new sexual experience before you try it with a partner).
2. Try out anal play first. Before embarking on the full monte of penetrative, anal sex, you can—and should!—give lighter anal play a try. This is open to interpretation, and could mean anything from toys to fingers or mouths. It'll give you a lower-pressure idea of what the ~sensations~ of anal stimulation feel like, and is a way of working up to the big show. Or not! If you decide some light anal play is all you're interested in, camp out there forever. No rules here, except to use lube, have consent, and USE LUBE.
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