Bone marrow transplant is a new type of treatment. In this procedure, your bone marrow is removed, treated with drugs to kill any cancer cells, and then frozen. Surgically removing one cancerous testicle doesn't make a man impotent. The artificial implant has the same weight and feel of a normal testicle. The surgical removal of lymph nodes doesn't affect ability to achieve an erection or orgasm but may cause sterility by interfering with ejaculation.
Some men recover the ability to ejaculate without treatment.
Medication may help others. Special surgical techniques may protect a man's ability to ejaculate. Radiation therapy for testicular cancer usually doesn't change ability to have sex. However, it does interfere with sperm production. The effect is usually temporary, with most men regaining their fertility within a few months.