I was told that sign language does not qualify as actual speech (ergo one cannot make a beracha via sign language) as such would obscene gestures be permissible (since they would ostensibly not violate nivel peh, as they are not made by the mouth) or would they be forbidden for some other reason?
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There is a Ben Yehoyada in כתובות דף ח ע׳ב who points out that Chazzal made a distinction between נבול פה, and כל המנבל פיו. The first refers to speaking perverse language, the second refers to making perverse gestures with one's tongue.