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If your foreskin is very tight it can be uncomfortable to have sex or even an erection. A doctor can easily take a bit off it or make it less tight by making a small incision. On the 'back' of the glans penis you will find an elastic band of tissue. In some boys, this band is too tight, which means that it can tear during sex or masturbation. This leads to a strong bleeding, but is, apart from that, not dangerous at all. The frenulum can be operated longer.