I've noticed when I get highly sexually aroused, my fingers get numb, and so do my lips. Is this normal?

I saw Ben Wa balls in a sex store and it says they improve sexual pleasure by improving vaginal tone and can even be worn during sex — is this true? Do they work and are they pleasurable?

If a woman doesn't come or have an orgasm, can her ovaries hurt just like a man's testicles can hurt if he doesn't come?

If one masturbates but does not get involved in any other sexual activities, is that person considered to be sexually active?

I would wish to know about the health implications of men using vibrators. I seem to have developed a fungus/mold. I would like to know more before a health check, approaching in complete ignorance. Thank you.

If you were a woman, who wanted to be a man, could you get a penis? And once you got your penis, could you masturbate, ejaculate, and experience other male sexual behaviors?

And vice versa. If you were a man, who wanted to be a woman, could you then get your penis removed, and then masturbate?

Since orgasms cause a release of endorphins into one's cerebral-spinal fluid and endorphins are also somewhat responsible for the emotion of happiness, etc., is it possible that excessive masturbation and/or intercourse would lead to a depleted level of endorphins in the system that could in turn cause one's affect to become somewhat "flat"? Could a sustained low level of endorphins in the system induce depression and/or mood disorder?