It is very likely that the sudden appearance of second ejaculation in the boyfriend is caused by the recent fatigue of the kidney qi deficiency and insufficient androgen level, or it may be caused by the inflammation of the glans leading to excessive sensitivity of the glans, it is best to take a blood test for androgen level and glans nerve sensitivity to make a clear diagnosis. If it is a deficiency of kidney energy and insufficient androgen level, you can choose Jin Kui Kidney Qi Pills, Wu Zi Yan Zong Pills and Testosterone Undecanoate Capsules for 1-2 weeks to effectively relieve the symptoms. If it is clear through the examination that there is inflammation of the glans leading to high sensitivity of the glans, you can first use erythromycin ointment, fusidic acid cream symptomatic treatment for 5-7 days, after treatment of glansitis, then choose lidocaine gel, dacronin ointment to reduce the sensitivity of the glans can also effectively improve the problem of second ejaculation. At the same time, the glans should be cleaned with water every day to keep the local cleanliness and avoid inflammation.