Sperm does not generally live long in the anus. The environment of the rectum is unfavorable because sperm cannot survive under these conditions due to inappropriate pH, temperature and cervical mucus. Sperm viability is short lived other than the perfect conditions of woman’s reproductive system. After ejaculation, the sperm in the rectum faces various factors that cause it to degenerate rather quickly. Pregnancy is not a risk of engaging in unprotected anal intercourse as the sperm would have no chance to survive in rectal environment. When there is a concern of contraception or fertility in discussions, one must use the appropriate methods and seek health care professionals for specialized advice based on individual conditions.

Sperm require specific conditions to survive and move effectively. In the anus, which is part of the digestive system, the environment is not suitable for sperm survival.