The main reasons why the penis breaks the skin after each coitus are physiological and pathological factors. Common pathological factors are mainly foreskin glans or genital herpes. 1. Physiological factors: if the foreskin is too long or circumcised, the skin of the penis can be broken when sex is rough. Rupture site in the tether, this is due to the tether is short, in the erection of the tether is in a state of tension caused by the incision can be healed after the feasibility of tethering plastic surgery, loosening the tether can be. 2. Pathological factors: (1) circumcision: caused by bacterial or fungal infection, can appear penis and glans congestion, edema or even ulceration, in the friction stimulation of sexual life is prone to break the skin. (2) genital herpes: belongs to sexually transmitted diseases, there can be penis redness, swelling, blisters, ulcers, etc., easy to break the skin when subjected to sexual friction. There may be other reasons why the skin of the penis breaks after each intercourse, you should go to the hospital in time for examination and early treatment.