Why do gay men speak with a lisp?

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While not all gay males speak with the "gay lisp," some studies have found when people listened to audio recordings of male speakers and were asked to identify their sexual orientation, their guesses were accurate at rates greater than chance. Two studies did find that a subset of gay men phonate /s/ distinctively

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quote:

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In a similar study of female speakers, it was found that listeners could not tell lesbian speakers from heterosexual speakers. Other studies of lesbian identity do make references to voice use by lesbians typically using lower pitch and more direct communication styles.

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Where does that lisp come from? Why do some homosexual men adopt this lisp along with a modified intonation, while other gay men eschew this behavior in favor of a more "natural" phonology?