Is water that enters and exits the urethral opening considered impure and invalidating of ablution, and is the invalidation of ablution dependent on the water entering the urethra or merely on its entering the urethral opening?

If a Muslim inserts something into his urethra and it then comes out, it is impure and invalidates ablution. One should not inspect the male organ, or shake it, or try to force urine out of it, as these are Bid'ah (innovations) with no basis. The water remaining on the male organ after purification is considered pure. It is recommended, after performing istinja' (washing after urination/defecation), to sprinkle the underwear with water to avoid waswas (obsessive whispering), and in case of doubt, any wetness should be attributed to this sprinkling. It is advised to treat waswas with medicine, ruqyah (Islamic exorcism/healing), and behavioral therapy.