There is no danger in anal sex if done correctly.
Regarding STD's - always wear a condom. Prolonged or chronic anal sex can lead to the weakening of the anal sphincter muscle. This muscle controls the emptying of feces from that anus. Loss of control of this muscle can cause uncontrolled release of feces.
Many people claim that anal sex if done correctly does not have any risks. This is not the case medically, however, like most things in life there are risks and we can reduce those risks by taking some very simply precautions. First lets learn the risks: Anal sex can damage the anal tissue. Even when people use lots of lubrication during anal sex, there can be tearing of the tissue inside the anus, which is not as well protected as the skin outside the anus. Our external tissue is "kerotinized," meaning that it has layers of dead cells that create a thickened protective barrier. The tissue inside the anus does not have this feature. Without plenty of lubrication, anal tissue can tear quite easily, creating openings where bacteria and viruses can enter and cause disease problems, such as HIV/AIDs transmission. Repeated excess damage to anal tissue is also thought to increase the risk of anal cancer.
For this reason, anal sex is the riskiest form of sexual activity when it comes to the transmission of HIV/AIDS. Tiny tears in the anal tissue are like giant superhighways for the HIV virus, allowing them to get inside the body and enter the blood system. Anal tears provide an opening for all the other STDs as well. Included in STDs for this discussion would be Hepatitis. This applies both for the one receiving and giving anal sex; the tears in the anal tissue allow viruses out, not just in.
Also, It may be possible for repetitive anal sex to lead to weakening of the anal sphincter, which is the muscle that tightens after we defecate. Once weakened, feces can escape the anus against our will. Though one can expect the anal sphincter to require a few moments to close after anal sex this is not an issue of concern for your first time. Large insertions, and frequent insertions like those seen in the adult industry may lead to this issue.
Don't stop reading. Lots of activities have risks. When you ride your bike you could fall, get struck by a car, get a flat tire, run over a bunny or have your hair caught in the chain if you try to peddle with your face. That doesn't mean bikes are the enemy. Let's talk about some things to do which will reduce these risks and create a much more enjoyable experience for everyone involved. Like any form of sexual relation the best way to prevent an STD is abstinence until marriage. Logically, not religiously, this is the best form of HIV protection and any medical professional will tell you this. Now, as most of us don't always follow the best advice, myself included, what else can we do?
1. Always use protection, a condom, when performing anal sex. In this case, even if you are married the fecal matter has the potential to enter the urethra of the male and he would be best served by not allowing feces to enter his penis. From the female perspective not only does this reduce the chance of contracting an STD, but from a practical perspective it is much cleaner.
2. Use plenty of lubrication. Re-apply lubrication. A water based lubrication designed for intimacy should be used generously. This will reduce friction and the risk of anal tearing during intercourse. There is a difference between the resistance of normal intercourse and the resistance of friction between surfaces. When in doubt, use some more. The risk of using more lubrication is that you have to buy more for next time. The risk of not using any is that you tear the skin inside her anus and she bleeds gets an infection and never lets you perform anal sex again.
3.
Do not switch anus to vagina. Ladies we are taught to wipe front to bad to prevent spreading disease and getting fecal matter in our vagina. This is no different. You can start in the vagina and then switch to the anus. However, if you want to go back to the vagina, you must remove the condom used for anal and use a new condom. This will reduce the chance of infections and diseases associated with fecal matter in the vagina.
4
Go slow. The muscles of the anal sphincter need time to relax. Forcing a penis through this barrier dramatically increases the risk of anal tearing. Let the one receiving determine how fast the insertion should be. If you are receiving do not worry about the impatience of your partner. You are the one that will be bleeding. Often a good technique is to keep some pressure, but not enough to force past the sphincter. As the sphincter relaxes the penis will be allowed inside the anus. Come to a complete entry, and allow your partner to adjust to the object inside her anus. When she is ready, let her begin.
5.
Clean yourself before. It is not unreasonable to clean the inside of the anus before anal sex. Look up how to give yourself an enema, go into the shower, and do it. This will clean out most if not all of any fecal matter which may currently reside in the anus. Yes, that means you will have small parts of fecal matter exit the anus with the water. Better there in the shower than on your bed and on your partner. This will improve your experience dramatically. The difference: you can smash fecal matter into an almost liquid substance that smells worse than a baby diaper and stains a tower, or...you can clean your anus and enjoy the new and wonderful sensations without the embarrassment of fecal discharge.
6.
Clean yourself after. Everybody wants to cuddle. Go wash your penis and at least the outside of your anus and vagina. This reduces the time fecal matter will spend on sensitive parts of the body and thus the risk of diseases and infections. You should both try to urinate after anal sex to help remove any fecal matter which has been lodged into your urethra.
Life has risks. Sometimes we increase those risks because of the things we do, like anal sex. However, with some simple precautions we can reduce those risks to a manageable level. I hope this article has been helpful and you take the advice listed. Anal sex can be a wonderful addition to an intimate relationship, but have respect for your partner and yourself. Stay safe, stay clean.