Thank you for your question on ehealthforum.com
Sexual excitation and stimulation can cause discharge from male and female external genitalia. Masturbation can lead to climax and ejaculation with satisfaction of sexual desire. Your description fits normal process of sexual excitation and there appears to be no abnormality. However, if you think you are having some problem which is inexplicable, I suggest you to seek an appointment with your doctor for the advice and examination. Thank you.