Masturbation can be a form of autoeroticism The summary section of this article now contains a sentence similar to the above The old sentence was Masturbation is part of a larger set of activities known as autoeroticism which also includes the use of sex toys and non genital stimulation The old sentence had several problems It assumed that all masturbation was self masturbation But it s not one can masturbate another person and this is not autoeroticism It assumed that using sex toys was not masturbation But a vibrator is a sex toy and using one meets Merriam Webster s and now this article s definition of masturbation It assumed that non genital stimulation was not masturbation I don t think this article is currently clear about this But I expect that many experts would consider say nipple manipulation that led to orgasm to be masturbation For these reasons I rewrote the sentence It now says little its main purpose is to provide a link to the autoeroticism page We can decide later if this link is important enough to keep the sentence at all