Masturbation is the act of stimulating one's genitals to achieve sexual arousal and pleasure usually to the point of orgasm. The act of masturbation is very common, even among those with sexual partner.
It is usually the first sexual act experienced by most people and it is part of the growing child exploration of his body parts.
Masturbation can be self or mutual(between sexual partners) and is considered normal and a healthy part of sexual enjoyment in some cultures. However, some religions and cultures are against masturbation or even label it sinful and this can lead to guilt or shame about the act. Medically, masturbation is considered safe and normal. Most people usually deny the act of masturbation when confronted physically.
An online poll was conducted to ascertain the proportion of people who practice the act of masturbation. About 332 people participated in the poll and approximately 80% practice the act of masturbation while 20% don't. Out of the 80% who practice the act of masturbation, 53% are males while 27% are females and out of the 20% who don't masturbate 11% are females while 9% are males. In another independent research, about 95% of males and 89% of females reported they have masturbated.

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http://www.droleo.com/2017/07/the-act-of-masturbation-is-more-common.html?m=1