The reddish color of urine after having married life may be the cause of urinary tract infections, urinary stones, female gynecological diseases and so on. 1. urinary tract infection: when there is unclean sex, hygiene is not clean, will cause urinary tract infection, such as blood in the urine, frequent urination, urinary urgency, urinary pain and other discomforts. 2. Urinary stones: this disease can be due to stone stimulation of the urethral mucosa and bleeding, in the coitus can be caused by the stone violent movement and blood in the urine, can be accompanied by urinary pain, lumbago and other discomforts. 3. Gynecological diseases: for women who have blood in urine after intercourse, it may be caused by cervicitis, cervical polyps, endometritis and other reasons. It is recommended to go to the urology department or gynecology department for further examination, clear diagnosis and active treatment.