Cancer patients can have sex during the period of stable condition; cancer patients cannot have sex when their condition is not good. When cancer patients are in stable condition and their physical strength is relatively good, they can have sex appropriately to make them feel happy, enhance the couple’s relationship, help cancer patients release emotional pressure, and have a positive effect on the recovery of their condition. Cancer patients are in a rising condition, repeated condition, or cancer patients in the period of radiotherapy, the body is relatively weak, affected by the condition of the patient is in a very painful stage, at this time it is not appropriate to carry out sexual life, even if forced to carry out sexual life, the patient can not perform well, and the condition of the patient to cause adverse effects. Therefore, before having sex with cancer patients, they should consider their physical condition and consult the attending physician to understand the situation and determine whether they can have sex or not.