<s>[INST] Hello, I am 42 years old, 190 cm, 85 kg,married. I used to masturbate every couple day and sometimes every day. When I see blue movies, a crystal color stick liquid come out from my penis, I know it is not a sperm. Is that normal? how can I stop that? [/INST] helloThanks for query. The crystal clear liquid that you pass while watching porn moves is excessive secretion of mucus secreted by Bulk Urethral glands located in Bulgar part of urethra. This excessive secretion happens due to excessive secretion of mucus by these glands triggered by stimulation by audiovisual stimuli from watching sexual acts . It is absolutely normal phenomenon and there is no treatment to reduce or to stop it. Chat Doctor.  </s>