The maintenance of male sexual function mainly depends on normal erectile function and normal ejaculatory function. The maintenance of these functions requires not only perfect neurological innervation, but also sex hormones to maintain male libido and erectile function. The testicles are the main organ that secretes male androgens, and a healthy testicle is also sufficient to secrete the level of androgens that maintain male erection. Many patients who have had one testicle removed for various reasons, such as testicular tumor or testicular trauma, have not lost their sexual function, and this is the best clinical evidence.