Personaly I used to have the same fantasy, but I thinnk it stemmed from my insecurity in bed. Mostly I tried to learn to much from porn, where every lesbian scene seems to be something both women enjoyed. For me the thought of me watching a lesbian experience was more about learning something new. I grew out of it though thanks to a partner who helped me out by "instructing" me in what worked for her. I agree with all the others, if it is not something you want, definetly don't do it.

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I'm like a super hero, but with no powers or motivation.