Sexual life is easy to foreskin cracks may be the foreskin, foreskin glansitis, allergies and other factors. 1. Phimosis: the presence of male phimosis, too much force during sex, it will make the foreskin cracks, but also easy to repeatedly induced glans phimosis, if necessary, should be surgical treatment, will be too long foreskin excision. 2. glans penis: may be related to poor hygiene, due to the presence of local inflammation and infection, local stimulation, resulting in localized congestion and edema of the foreskin, during sex, will make the local cracks, accompanied by itching and stinging and other symptoms, after diagnosis, should be used to anti-infective drugs, such as erythromycin ointment, clotrimazole ointment and so on. 3. allergy: the use of stimulating toiletries, so that the foreskin there is an allergic reaction, in the sexual life will be easy to crack, accompanied by intense itching and other symptoms, after diagnosis, should use anti-allergy drugs, such as cetirizine and loratadine. If you have an allergic reaction to the foreskin during sexual intercourse and other abnormalities, it is recommended that you seek medical attention for appropriate examination and treatment, and use medication under the guidance of a doctor to avoid adverse effects.