The chances of becoming pregnant through anal sex are very slim as the sperm will need to fertilise the egg which is in no way possible unless semen has entered the vagina.
However there are two things that you need to take into consideration when you are thinking about anal sex.
Although the chances of becoming pregnant through anal sex are very slim it does not mean to say that it is impossible.There are the risky chances that your boyfriend could ejaculate just outside of your anus or even if he does ejaculate inside the anus,semen could possibly leak out and find its way into your vagina. Again becoming pregnant from a single sperm has a very slim chance however it is not impossible. Therefore if you are not looking to become pregnant it is advised that you use some sort of protection but the protection used is entirely up to you and your partner. (NOTE: If you decide to use a condom then you need to be seriously careful as the condom has an increased risk of breaking through anal sex as it can be quite tight)
But becoming pregnant should not be your only worry when you are thinking about having anal sex. Whilst the chances of becoming pregnant through anal sex are slim compared to the chances of vaginal sex,the risk of Sexually Transmitted Diseases/Sexually Transmitted Infections are very high the reason for this is that the friction with the additional tightness in anal sex can often lead to cuts,lacerations and bleeding that combined with seminal and other body fluids can lead to discomfort and serious infections such as HIV, Gonorrhoea and chlamydia.
If you have already had anal sex then I suggest you take an immediate trip to your doctor and arrange for a physical check up for any STD's. However if you have not already had anal sex then some serious advice from me would be to just stick with vaginal sex as you can use protection without high risks of failure and also you will have reduced risks of catching anything especially if you are using protection such as condoms.
It is also advised that once you have become sexually active in any sort of way (oral sex, anal sex and vaginal sex) you have a check up at least once a year for any possible STD's however it may be wise to have check ups when you change your partner in a relationship. This is not to cause embarrassment but it is for the importance for your own safety and those around you.
I hope my answer has become of use and Good Luck.
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