When not actively passing fluids, the male urethra is almost always collapsed. In that state, it is easy for "precious bodily fluids" - or just the normal mois

When not actively passing fluids, the male urethra is almost always collapsed. In that state, it is easy for "precious bodily fluids" - or just the normal moisture of its inner lining - to dry out at the external opening, sticking the urethra's walls together and producing such effects.