Sex can provide health benefits such as relieving headaches by releasing tension in blood vessels and reducing risks of premature death and prostate cancer. Regular sex may help avoid illnesses and burn calories, while also enhancing skin and hair through increased estrogen production. The largest recorded penis sizes are 9.5 inches flaccid and 13.5 inches erect, while average sizes are 3.5-3.7 inches flaccid and 5.0-5.7 inches erect.