you never know when the urge to cum will takeover. For me, it was the beauty of the sights, sounds and feeling of the cool river air during my nature walk. I strip my shirt off, and bring myself to cum with just my fingers, as natural as the surroundings. (hope none of the cars from the road saw me) (also the sounds of the river is so wonderfully soothing, a major ASMR turn on if that is your thing!)