What does masturbation mean ?
I don't know the definition of it.

Main Entry: mas·tur·ba·tion
Pronunciation: \ˌmas-tər-ˈbā-shən\
Function: noun
Date: 1603
: erotic stimulation especially of one's own genital organs commonly resulting in orgasm and achieved by manual or other bodily contact exclusive of sexual intercourse, by instrumental manipulation, occasionally by sexual fantasies, or by various combinations of these agencies

I am closing this post, the original poster is giving sex advice about STD on another thread but here pretends not to know about this.