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This is Dr. David
are you taking a shower and washing with soap and water after having sex?
are you using a condom? lubricant?
after sex, it is important to shower and wash with soap and water to clean your skin to help prevent infection and itchiness
also if you sweat in your private area a lot or if there is a lot of moisture in the groin area, this can lead to a skin fungal infection like jock itch which can cause itching.
you would need an antifungal powder or spray like Tinactin or Lamasil or Nystatin antifungal treatment to fight jock itch fungal infection.
let me know if you have questions.
do you have any other questions?