Sexual assault happens between all genders and orientations.
Having proper statistics is incredibly hard, just look at how few women actually report to the police their sexual assault and often its not taken seriously or brush off, do you think that LGBTQ+ will report? Even less likely.
However, even in a queer bar , except for those toxic lesbians ( I swear its often the same type of wanna be dude bro masc trying to act tough) , the chance of being sexually harassed is a lotttttttt lower in the lesbian scene than just walking down the street and be harass by some straight male passerby