The development of the anus was an important stage in the evolution of multicellular animals. It appears to have happened at least twice, following different paths in protostomes and deuterostomes. This accompanied or facilitated other important evolutionary developments: the bilaterian body plan, the coelom, and metamerism, in which the body was built of repeated "modules" which could later specialize, such as the heads of most arthropods, which are composed of fused, specialized segments.

You may not want to know about this one. It happens when you swallow or breathe in the eggs of tiny worms. They get in your digestive system through contaminated food and things like bed linens, bathroom fixtures, toys, and sandboxes. It’s more common in children. The itching usually happens at night, when a female worm lays eggs around the anus. You may see them in your underwear or in the toilet after a bowel movement. They look like tiny pieces of white thread. If you or your child has pinworms, your whole family may be treated for them.
Using protection during anal sex is important to reduce your risk of catching an STI. For penetrative sex, make sure you use a condom and lots of lube – some people feel safer using extra-thick condoms for anal sex. Dental dams also offer good protection for rimming. Taking pre-exposure prophylaxis (PrEP) is another way to prevent HIV infection, but it may not be available everywhere.
11. The person doing it should err on the shallow side. Everything that goes in should be "just the tip." The nerve endings you're trying to stimulate are in the anus—hence, the moniker "rimming"—and not all the way up there, which is generally the painful part and also the part that makes you feel like you need to take a huge dump. Imagine it like a basketball hoop, and the ball should just be rolling around the rim of the basket, not actually making the basket. Does that help? I know nothing about basketball.

Your nerve endings are sensitive for a reason. They alert your brain to pain so you can prevent yourself from getting seriously injured, Dr. Chinn says. While numbing creams might make anal penetration feel easier, they don’t make it any easier physically. By numbing your anus, you or your partner could be pushing your body past its point of comfort without even realizing it.
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"I tried it once a long time ago. The guy I was seeing wanted to do it, and I was resistant but eventually gave in. He tried to put it in, but it just hurt too much. I don't think he used lube, and it's just really tight. Maybe I'd do it again with the right person if I had a lot of trust in him. Either way, it's not something at the top of my list." —Clara A.
b : of, relating to, or characterized by personality traits (as orderliness, frugality, and obstinacy) considered typical of fixation at the anal stage of development : anal-retentive —often used in nontechnical contexts to describe someone as extremely or excessively neat, careful, or precise — compare genital sense 3, oral sense 3, phallic sense 2
Christian texts may sometimes euphemistically refer to anal sex as the peccatum contra naturam (the sin against nature, after Thomas Aquinas) or Sodomitica luxuria (sodomitical lusts, in one of Charlemagne's ordinances), or peccatum illud horribile, inter christianos non nominandum (that horrible sin that among Christians is not to be named).[130][131][132]
It really is a new, fun experience if you and your sexual partner are ready to take the next step in being intimate with each other. I do agree that it is something that needs commitment especially since it can be quite painful at first I used to think it was dirty and unappealing, but if my opinion on this can be changed I am sire it can be for anyone else.
b : of, relating to, or characterized by personality traits (as orderliness, frugality, and obstinacy) considered typical of fixation at the anal stage of development : anal-retentive —often used in nontechnical contexts to describe someone as extremely or excessively neat, careful, or precise — compare genital sense 3, oral sense 3, phallic sense 2
Now flip that over… You had anal sex. In my experience it comes back out pretty quick as I pull out. So where does it go? Straight down via gravity to the sheets… so similar to the above, it (quicker than you think) can come out and slide down to your vaginal opening. How close are the two? If you don’t already know, (CLEANLY WITHOUT TOUCHING EACH OTHER) slide a finger in each hole at the same time. What would you say, MAYBE a 1/4″ on average? GUYS Note: Gently squeezing this area with your thumb and finger can cause pleasure for her and works great during oral. 🙂

b : of, relating to, or characterized by personality traits (as orderliness, frugality, and obstinacy) considered typical of fixation at the anal stage of development : anal-retentive —often used in nontechnical contexts to describe someone as extremely or excessively neat, careful, or precise — compare genital sense 3, oral sense 3, phallic sense 2
Most anal cancers are cured with combination therapy. If caught early, many cancers that come back after nonsurgical treatment are treated effectively with surgery. While combination radiation/chemotherapy produces more side effects, this approach also results in the best long-term survival rates. After completing this treatment, as many as 70-90% of patients are still alive and cancer free at 5 years.
27.“From a straight guy’s perspective: Like a lot of the previous comments, there’s an element of the taboo involved in it. Anal isn’t quite as accepted in ‘mainstream’ sexual discussions yet, and as such remains a bit out of reach for many curious individuals. Having already done anal on occasion with my girlfriend, the taboo is still there but has been transferred from a ‘mysterious and unknown’ sort of taboo to a ‘so rare as to be mystical’ taboo. On the pleasure side of things, it provides a nice change in sensation from vaginal, oral, and manual stimulation. And while it may not provide as much physical pleasure, its infrequency offsets that since it’s not something you’re typically used to like one of the above three. Also, the intimacy factor can’t be overstated. Because it’s such a rare occurrence for most guys (myself included), it carries a lot of weight when your girlfriend/wife/FWB/etc. gives you the opportunity. It requires more trust and communication than regular sex, and oftentimes your SO is sacrificing some of their comfort (and possibly dignity) to give you pleasure. It’s honestly both thrilling and humbling.”
Local resection: A surgical procedure in which the tumor is cut from the anus along with some of the healthy tissue around it. Local resection may be used if the cancer is small and has not spread. This procedure may save the sphincter muscles so the patient can still control bowel movements. Tumors that form in the lower part of the anus can often be removed with local resection.

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."
9. Between thin water-based lubes (like Astroglide) and thicker ones (KY), go with the thicker ones, because they don't dry out as quickly. In sex educator Tristan Taormino's crazy-helpful Ultimate Guide to Anal Sex for Women, she mentions that Crisco has been a favorite of the LGBT community for a long time, but it's bad to use with condoms because it can eventually poke tiny holes in the latex.
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