Dr. Dudley Danoff, a urologist and author of “The Ultimate Guide to Male Sexual Health,” has stated in interviews and articles that high temperatures can cause the blood vessels in the penis to dilate, leading to increased blood flow and potentially causing the penis to appear larger or fuller. He also suggests that hot weather may cause the testicles to enlarge and hang lower in order to regulate their temperature and keep sperm healthy. – Dr. Dudley Danoff
