Why is there always fisting?

I think the translation could have been smoother, but that might be wrong/ just me. 
I don’t think it’s a bad book, and I may even try again at a later time, but it just wasn’t for me this go round.
Also, as a sapphic person, I am befuddled at the amount of fisting, especially un-planned/un-prepped for fisting I’ve encountered in lesbian literature. It seems disproportionate to our lived experiences lol