Hemorrhoids Steer clear of anal sex if you have hemorrhoids. That can make the experience painful and uncomfortable. Placenta previa. Having anal sex can increase the risk of bacterial infection, pregnancy, sex can lead to bacterial infections in the ways we mention above, it can It is important to use a condom when having anal sex to prevent pregnancy. Many people have questions about anal and oral sex. Are they safe? What are the risks? Can you get pregnant or get a sexually transmitted.