au·to·er·o·tism 
(ô′tō-ĕrə-tĭz′əm) or au·to·e·rot·i·cism (-ĭ-rŏtĭ-sĭz′əm)
(ô′tō-ĕrə-tĭz′əm) or au·to·e·rot·i·cism (-ĭ-rŏtĭ-sĭz′əm)n.
1. Self-satisfaction of sexual desire, as by masturbation.
2. The arousal of sexual feeling without an external stimulus.
au′to·e·rotic (-ĭ-rŏtĭk) adj.