I am a fit man who does a lot of trail running and also live in a super hot climate. I usually wear as little as possible when I run, because of the heat. One day it was over 100 degrees Fahrenheit and I decided "Screw it! Nobody will see me in the forest anyway." and I took off my shorts ran for about a 2 miles totally butt-naked. This is a forest trail behind my house where literally nobody would see me, but I was still nervous the entire time that I was running with my junk out. The constant motion of my naked ♥♥♥♥ and balls bouncing caused me to get a boner. By the end of the 2 miles, I was running with a full hard-on jumping around in the open, so I got embarrassed and finally decided to put my shorts back on before someone saw.

⠁⠁⠁⠁⠁⠁⠐⢶⣶⣶⣶⣤⣤⡀⠁⠁⣠⣀⣀⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁
⠁⠁⠁⠁⠁⠁⠁⠁⠙⢿⣯⣠⣶⣦⣤⣤⣌⣛⠻⢇⣠⣤⣤⠁⠁⠁⠁⠁⠁⠁
⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁⠻⣿⣿⣿⡟⢉⡤⢤⣤⣤⡍⠛⢡⢖⣥⣶⣦⣀⠁⠁
⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁⣠⣿⣿⣿⡏⣭⣶⣿⣿⠟⢿⣦⡡⣿⣿⡇⠁⡙⣷⡀
⠁⠁⠁⠁⠁⠁⠁⣀⣴⣿⣿⣿⣿⣿⣿⡞⣿⣿⡟⢀⡀⣿⣿⢻⣿⣿⣀⣁⣿⠏
⠁⠁⠁⢀⣠⣶⣿⣿⣿⣿⣿⣿⣿⣿⣟⢰⢻⣿⣇⣈⣴⣿⠟⢨⣛⠛⠛⠉⠁⠁
⠁⣠⣶⣿⣿⡟⢋⠤⣤⠘⢿⣿⣧⡙⠻⠌⠒⠙⠛⢛⣫⣥⣿⣦⡈⠉⣡⣴⣾⠇
⢰⣿⣿⣿⣿⠁⡇⠁⠙⠷⣤⡙⠻⢿⣿⣶⣶⣶⣿⣿⣿⣿⣿⣿⣿⠿⠟⠋⠁⠁
⠘⣿⣿⣿⣿⣆⠻⣄⠁⣀⡀⠉⠙⠒⠂⠉⠍⠉⠉⠉⠉⣩⣍⣁⣂⡈⠠⠂⠁⠁
⠁⠘⢿⣿⣿⣿⣦⡉⠳⢬⣛⠷⢦⡄⠁⠁⠁⠁⠁⣀⣼⣿⣿⠿⠛⠋⠁⠁⠁⠁
⠁⠁⠁⠉⠻⢿⣿⣿⣷⣦⣬⣍⣓⡒⠒⣒⣂⣠⡬⠽⠓⠂⠁⠁⠁⠁⠁⠁

⣿⣿⣿⣿⣿⢻⣿⣿⣿⣿⣿⣿⣆⠻⡫⣢⠿⣿⣿⣿⣿⣿⣿⣿⣷⣜⢻⣿ ⣿⣿⡏⣿⣿⣨⣝⠿⣿⣿⣿⣿⣿⢕⠸⣛⣩⣥⣄⣩⢝⣛⡿⠿⣿⣿⣆⢝ ⣿⣿⢡⣸⣿⣏⣿⣿⣶⣯⣙⠫⢺⣿⣷⡈⣿⣿⣿⣿⡿⠿⢿⣟⣒⣋⣙⠊ ⣿⡏⡿⣛⣍⢿⣮⣿⣿⣿⣿⣿⣿⣿⣶⣶⣶⣶⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿ ⣿⢱⣾⣿⣿⣿⣝⡮⡻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠿⠛⣋⣻⣿⣿⣿⣿ ⢿⢸⣿⣿⣿⣿⣿⣿⣷⣽⣿⣿⣿⣿⣿⣿⣿⡕⣡⣴⣶⣿⣿⣿⡟⣿⣿⣿ ⣦⡸⣿⣿⣿⣿⣿⣿⡛⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡇⣿⣿⣿ ⢛⠷⡹⣿⠋⣉⣠⣤⣶⣶⣿⣿⣿⣿⣿⣿⡿⠿⢿⣿⣿⣿⣿⣿⣷⢹⣿⣿ ⣷⡝⣿⡞⣿⣿⣿⣿⣿⣿⣿⣿⡟⠋⠁⣠⣤⣤⣦⣽⣿⣿⣿⡿⠋⠘⣿⣿ ⣿⣿⡹⣿⡼⣿⣿⣿⣿⣿⣿⣿⣧⡰⣿⣿⣿⣿⣿⣹⡿⠟⠉⡀⠄⠄⢿⣿ ⣿⣿⣿⣽⣿⣼⣛⠿⠿⣿⣿⣿⣿⣿⣯⣿⠿⢟⣻⡽⢚⣤⡞⠄⠄⠄⢸⣿

X_x

⠁⠁⠁⠁⠁⠁⠐⢶⣶⣶⣶⣤⣤⡀⠁⠁⣠⣀⣀⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁
⠁⠁⠁⠁⠁⠁⠁⠁⠙⢿⣯⣠⣶⣦⣤⣤⣌⣛⠻⢇⣠⣤⣤⠁⠁⠁⠁⠁⠁⠁
⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁⠻⣿⣿⣿⡟⢉⡤⢤⣤⣤⡍⠛⢡⢖⣥⣶⣦⣀⠁⠁
⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁⣠⣿⣿⣿⡏⣭⣶⣿⣿⠟⢿⣦⡡⣿⣿⡇⠁⡙⣷⡀
⠁⠁⠁⠁⠁⠁⠁⣀⣴⣿⣿⣿⣿⣿⣿⡞⣿⣿⡟⢀⡀⣿⣿⢻⣿⣿⣀⣁⣿⠏
⠁⠁⠁⢀⣠⣶⣿⣿⣿⣿⣿⣿⣿⣿⣟⢰⢻⣿⣇⣈⣴⣿⠟⢨⣛⠛⠛⠉⠁⠁
⠁⣠⣶⣿⣿⡟⢋⠤⣤⠘⢿⣿⣧⡙⠻⠌⠒⠙⠛⢛⣫⣥⣿⣦⡈⠉⣡⣴⣾⠇
⢰⣿⣿⣿⣿⠁⡇⠁⠙⠷⣤⡙⠻⢿⣿⣶⣶⣶⣿⣿⣿⣿⣿⣿⣿⠿⠟⠋⠁⠁
⠘⣿⣿⣿⣿⣆⠻⣄⠁⣀⡀⠉⠙⠒⠂⠉⠍⠉⠉⠉⠉⣩⣍⣁⣂⡈⠠⠂⠁⠁
⠁⠘⢿⣿⣿⣿⣦⡉⠳⢬⣛⠷⢦⡄⠁⠁⠁⠁⠁⣀⣼⣿⣿⠿⠛⠋⠁⠁⠁⠁
⠁⠁⠁⠉⠻⢿⣿⣿⣷⣦⣬⣍⣓⡒⠒⣒⣂⣠⡬⠽⠓⠂⠁⠁⠁⠁⠁⠁

⠁⠁⠁⠁⠁⠁⠐⢶⣶⣶⣶⣤⣤⡀⠁⠁⣠⣀⣀⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁
⠁⠁⠁⠁⠁⠁⠁⠁⠙⢿⣯⣠⣶⣦⣤⣤⣌⣛⠻⢇⣠⣤⣤⠁⠁⠁⠁⠁⠁⠁
⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁⠻⣿⣿⣿⡟⢉⡤⢤⣤⣤⡍⠛⢡⢖⣥⣶⣦⣀⠁⠁
⠁⠁⠁⠁⠁⠁⠁⠁⠁⠁⣠⣿⣿⣿⡏⣭⣶⣿⣿⠟⢿⣦⡡⣿⣿⡇⠁⡙⣷⡀
⠁⠁⠁⠁⠁⠁⠁⣀⣴⣿⣿⣿⣿⣿⣿⡞⣿⣿⡟⢀⡀⣿⣿⢻⣿⣿⣀⣁⣿⠏
⠁⠁⠁⢀⣠⣶⣿⣿⣿⣿⣿⣿⣿⣿⣟⢰⢻⣿⣇⣈⣴⣿⠟⢨⣛⠛⠛⠉⠁⠁
⠁⣠⣶⣿⣿⡟⢋⠤⣤⠘⢿⣿⣧⡙⠻⠌⠒⠙⠛⢛⣫⣥⣿⣦⡈⠉⣡⣴⣾⠇
⢰⣿⣿⣿⣿⠁⡇⠁⠙⠷⣤⡙⠻⢿⣿⣶⣶⣶⣿⣿⣿⣿⣿⣿⣿⠿⠟⠋⠁⠁
⠘⣿⣿⣿⣿⣆⠻⣄⠁⣀⡀⠉⠙⠒⠂⠉⠍⠉⠉⠉⠉⣩⣍⣁⣂⡈⠠⠂⠁⠁
⠁⠘⢿⣿⣿⣿⣦⡉⠳⢬⣛⠷⢦⡄⠁⠁⠁⠁⠁⣀⣼⣿⣿⠿⠛⠋⠁⠁⠁⠁
⠁⠁⠁⠉⠻⢿⣿⣿⣷⣦⣬⣍⣓⡒⠒⣒⣂⣠⡬⠽⠓⠂⠁⠁⠁⠁⠁⠁