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During puberty it's normal for the frequency and spontaneity of erections to change. Hormonal shifts affect sexual development differently for everyone. While early puberty often involves more frequent and spontaneous erections, this can change as puberty progresses. There's nothing wrong it's natural.

If you are going through an itchy penis, you should refer a urologist or a dermatologist with a specialization in genital conditions. They will be able to diagnose you properly and suggest the best treatment for you. It is advised to consult a physician instead of self-diagnosing and applying home remedies.

Testing for HIV after intimate contact is wise­. Your non-reactive result sugge­sts no HIV infection currently. Yet, re­member HIV symptoms like fatigue­, flu-like feelings, and swolle­n glands can take months to appear. To confirm, get re­tested after 3 months have­ passed. 

Masturbation is normal and healthy sexual activity for most people and normally does not cause permanent damage to the penis. But excessive or aggressive masturbation may lead to temporary discomfort, such as soreness. Its impt to practice moderation and use lubrication if needed to avoid excessive friction.