It is interesting :: First records of preservation means such a condom date from Ancient Egypt, where condoms were made of animal skin. Nowadays there is a great variety of condoms, which differ in color, texture and smell.
Masturbation and the attitude :: of some Americans to it roots in history. There exist many evidences proving that just few centuries ago some parents thought the masturbation is a sin or leads to man diseases. They compelled their daughters to wear gloves made of special material called steel wool (like scourers) at night. In addition, they forced them to pour a powder on genitals that made all touches to them very painful. The boys were forced to wear at night metal chastity belts. Of course, the erection is such "clothes" was also painful. Sometimes their methods were very brutal, they new no bounds. To prevent masturbation they pieced the foreskin of their sons with a wire and soldered the ends. Thus the foreskin didn't move. Parents really believed masturbation leads to madness, illness, blindness, impotence and sexual pathologies. In our days it was already proved that it's not true.
Realistic vagina is :: a sex toy, in the form of female genital system, stimulating the penis. The role of artificial vaginas is extremely high in the prevention of various diseases, like prostatitis and adenoma of prostate. All these diseases are very dangerous for the whole male genital system. To avoid this, the ejaculation should be as frequent as possible. Of course, artificial vaginas can't replace real woman but the feelings during its use are very perceptible. Thanks to very active massage and various nubs, placed inside the vagina, the orgasm is very strong. Any vagina enfolds the penis tightly so the feelings are very similar to those that appear with young woman. The models of vagina vary in forms and prices. There are simple models and models with vibrating motor or pneumatic device. Moreover, there are models with simple appearance and models resembling real prototype of female genitals. Realistic vaginas are used not only for masturbation but also to erect the penis before sex.