Solitary pleasure

Masturbation is the stimulation or manipulation of the genital organs to proportionate sexual pleasure. This definition does not have anything to do with the the putative latin etymology of the word. “Manu stupare” would literally mean to rape oneself.
Since Victorian times,19th century and beginning of the 20th century, masturbation had been regarded as something perverse, immoral, dirty and unhealthy. It was even related to diseases like tuberculosis, craziness, paralysis, hair loss and blindness. For these reasons, in ancient times every act related to masturbation was condemned and there were instruments to avoid it.

Today, it is a practice that although it does not cause as much polemic as it used to, it is not something people feel comfortable talking about. It is now considered to be an important element in our sexual learning. There is no scientific evidence that it can cause psychological of physical damage and on the other hand, it is regarded as a fun, healthy and liberating practice. Apparently masturbating may even protect against prostate cancer (there's more information about it in this link http://www.newscientist.com/article/dn3942-masturbating-may-protect-against-prostate-cancer.html).

In conclusion: have fun with yourselves,there's nothing wrong with it!