Hi doctors. lets say if a man left some semen on a toilet seat. if a woman were to use the toilet seat after him, could this cause pregnancy? thanks?

I suppose a girl could immediately scrape up ejaculate from any location & shove it in her vagina. That might get her pregnant. That would be gross. In medicine we know better than say always or never, so the chances of this happening are miniscule. Semen/sperm will quickly become inactivated/die when they are not in the protected environment of the female genitals.

While you are not at risk of pregnancy from this episode, your behavior is putting you at risk of pregnancy and STDS. Visit this site for guidance on safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines Get HPV vaccine Use contraceptive all the time, every time. Wish you good health!