Cervical Ectropion or Cervicitis: This condition is characterized by the presence of columnar cells on the ectocervix, which can cause bleeding after sexual intercourse due to the mechanical trauma. It's a common and benign condition that can cause post-coital bleeding.

Vaginal Dryness or Atrophy: Insufficient lubrication during sex can cause vaginal tears or irritation, leading to bleeding. This is common in postmenopausal women or those with hormonal imbalances.
Uterine Fibroids: These are benign tumors that can grow in or around the uterus. They can cause bleeding after sex if they are submucosal or if they distort the uterine cavity, making it more susceptible to bleeding.
Endometrial Polyps: These are growths in the lining of the uterus and can cause irregular menstrual bleeding, including bleeding after sex.

Cervical Cancer: Although less common, cervical cancer can cause post-coital bleeding. It's crucial to not miss this diagnosis as early detection significantly improves prognosis.
Endometrial Cancer: Similar to cervical cancer, endometrial cancer can also present with post-coital bleeding and must be considered to ensure timely diagnosis and treatment.
Pelvic Inflammatory Disease (PID): PID can cause bleeding after sex due to the inflammation of the reproductive organs. It's a serious condition that requires prompt treatment to prevent long-term complications.

Vaginal Cancer: This is a rare type of cancer that can cause bleeding after sex. Due to its rarity, it might not be the first consideration, but it should be included in the differential diagnosis to ensure comprehensive evaluation.
Urethral Diverticulum: A condition where a pouch or pocket forms in the wall of the urethra, which can cause bleeding during or after sex. It's less common but should be considered in the appropriate clinical context.
Trauma: Physical trauma to the genital area can cause bleeding after sex. This could be due to sexual assault or accidental injury during sexual activity.