I can move my testicles; scrotum; and not erect penis up into my body without pain. I can put two fingers or other items right behind the scrotum two inches up into my body. If stimulated like you would a vagina I can have multiple orgasms with or without a erection or ejaculation. Sometimes the ejaculation is only clear and does not feel like the testicles are active. Could I injure something doing this?