The tissue and skin around the anus acts as a protective barrier for the bottom half of your digestive tract. However, the tissue inside the anus is thinner, delicate, and more likely to tear and bleed as a result of penetration. This increases the likelihood of passing infections, viruses, or bacteria between partners. Even two partners who don’t have any sexually transmitted infections (STIs) can still pass bacteria between each other through these tears in the skin.
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