Laughing with your hands over your eyes is unisex, but there is an old saying that "laughing without showing your teeth" stands for etiquette, so smiling with your hands over your mouth is generally used by girls.
I remember when the company held a birthday party for employees last month, one of the activities was to draw lots to perform programs, and one of my colleagues drew lots to tell jokes. It happened that this colleague loves to read jokes, so when he told a joke vividly, everyone burst out laughing. Some people cover their eyes and laugh, some people cover their mouths and some people laugh loudly. The whole activity room is full of laughter and excitement. 、
Therefore, people's demeanor and movements are sometimes influenced by the outside world, such as covering their eyes or grinning, which is more natural.