This is a question I've always pondered myself Lilith. I'm glad you asked it.

For me, I think that someone watching me masturbate with my fingers is far more personal since it is the way I have done it since I was very young, and I have to move my fingers in a very specific way which is personal to me. Also, it takes longer so again, I'm letting my vulnerability come to the fore and that can be highly erotic for both my partner and myself, providing there is a high level of trust and respect in the relationship.

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