Uniformed 3D animation futa babes having sex in a museumUntreated sexually transmitted infections STIs can lead to potentially serious health problems. Jennifer CaudleMD, family physician and assistant professor. You can find these products at most drug stores and pharmacies. You can reduce your risk for infection by changing side affects of anal sex and washing well. Healthy Sex for Women. Penetration without lubrication can tear the delicate tissue inside the anus, which can lead to pain and bleeding.