What is the situation of irregular bleeding after menstrual sexual life?

Patient's question:

Detailed medical condition and consultation purpose: My partner and I had sexual intercourse during our last menstrual period. Since then, for the past two months, irregular bleeding has occurred after each period. What could be the reason?
Duration of the current illness: Two months
Current general condition: Irregular bleeding always occurs after each menstrual period
Additional question: Urgent response is awaited...

Doctor's answer:

Here is the English translation of the provided text, with line breaks preserved as instructed:
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Hello: Sexual intercourse during menstruation can cause local congestion, leading to increased menstrual flow. The penis itself carries bacteria, and during entry and exit from the vaginal opening, it can introduce bacteria from the external genital area into the vagina, allowing external pathogens to invade. During menstruation, a woman's body has a weakened immune system, and sexual intercourse at this time can lead to pelvic infection, causing inflammation in the fallopian tubes and other areas, potentially resulting in infertility. Additionally, sexual intercourse can injure the vaginal mucosa. Furthermore, the inner lining of the uterus, after shedding during menstruation, is in a state of fine wounds, similar to the vagina. At this time, the uterus has almost no resistance. Moreover, during sexual climax, rhythmic contractions of the vaginal wall (one-third of its length) and the uterus can push pathogens into the uterine cavity, leading to infection.
In summary, sexual intercourse during menstruation is harmful to women's health, and adolescent girls should pay particular attention. In this regard, neither men nor women should seek temporary pleasure at the expense of lifelong health. Many gynecological diseases or infertility cases are caused by infections due to poor menstrual hygiene during the first menstrual period, leaving lifelong regrets.
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