Is it possible to get pregnant from unprotected anal sex - can sperm live three days in the anal canal?

No, but ...: No, you cannot get pregnant from anal sex alone.But you can get pregnant if any sperm gets into the vagina before or after the anal sex.It is still important to use protection during anal sex to try to prevent unwanted pregnancy. As far as how long sperm can live in the anal canal - 3 days - maybe. The environment is not ideal for sperm and with bowel movements it is probably less.