Strange: Fisting isn't entirely uncommon. Just because you find it revolting doesn't mean others do. Rent/download some
real lesbian porn sometime... it tends to be rather kinky. Hell, the woman- (and lesbian-) owned sex toy store ono and I frequent has some rather large dildos, including a fist dildo. This is a place that does not generally contain shitty "novelty" toys. Not saying they sell a bunch of them, but they're stocked because their clientèle wants it, not because some corporate douche at Penthouse told them to stock it.
As for whether sex can take place without a penis, you're obviously free to believe whatever you want. I'd merely point out that the
vast majority of people disagree with you, and with good reason. Your attitudes toward sex are absolutely in the minority, and who are you to proclaim that lesbians must be either somewhat asexual or secretly yearning for cock? I'd love to see you say that in one of the lesbian bars around here, but then they'd end up disproving your general view that women are less capable of violence too
It's not that you believe what you believe about sexuality that's most frustrating, it's that you believe it in such a way as to refuse any possibility of being wrong
about what other people feel.