There is no necessary relationship between watching porn and menstruation, but frequent watching of porn accompanied by masturbation may have some effect on menstruation. The main reason for this is that regular masturbation can leave the body in a state of prolonged fatigue and weakness, which can lead to endocrine disruptions and abnormal menstruation. In addition, if you watch porn and masturbate during your period, it may cause infection and lead to gynecological inflammation such as vaginitis, and even increase the risk of endometriosis, which can lead to dysmenorrhea. Therefore, the occasional viewing of pornography is generally not a big problem. However, it is best not to watch porn and masturbate for a long time, especially not during your period, and be sure to pay attention to good menstrual hygiene.