Is NOBODY wrong in the post ? POST : Title makes it sound obvious but his girlfriend called me an asshole so :( turning to reddit. If it means anything, I'm asexual and my brother and his gf know it

I'm staying with my brother because the company I worked for went under. I spend most of my day applying for jobs, but shits hard in my city and I'm really grateful to my brother for letting me sleep on his couch (hell it's a comfortable ass couch)

The first week I was there I got 'home' and grab a beer and relax and my brother comes home. We make talk about our day and later his gf comes home (they live together) and grabs him by the shirt and basically caveman drags him back to the bedroom. Since then they've fucked 3-4 times a week I don't really keep track, but I feel so fucking awkward. it's weird when you know what your brother is into..

anyway I asked after a couple weeks of this if they could do it when I'm not around and he apologized but told me he's not gonna change how he does stuff in his own house. Fair enough, I guess. I know your girl makes you shine her boots (??is that actually a kink) and tells you to slap her so hard she needs a neck brace and I'm not judging but it's really LOUD. it doesn't even sound like sex, she says something ridiculous like that and all I hear is giggles from her it's so weird

He's been with his girlfriend for a year, she's a real sweet girl but she has the mouth of a sailor, it can really give a guy whiplash tbh but I don't really have an issue with it, I think she didn't mean to be so harsh because it's just the way she is but she came up to me the next day and called me an asshole. Said I don't have the right to dictate what she does "in her own fucking house", said I'm not her fucking dad, told me to gtfo if I don't like it

I told my brother his gf was out of line and she basically had a meltdown and told me she has plenty of dildos if I need to replace the stick in my ass with "something better" and said I need to get laid and not "fucking worry what she's doing with (brother)"

I don't fucking care what they do!!! the problem is I can hear everything!! how can i stay out of their business if they make it my business??

My brother stepped in and told me he'd get me some headphones, but then his girlfriend went off again about how this is her house too and she didn't want "your asshole brother" here (it isn't even her house, my brother bought it) Now they're arguing over this and I feel bad but I don't think I was being  an asshole

tldr brother's girlfriend is really mad that I asked them not to have loud sex while I'm in the house