<human>: Hi Reddit, fuck using a throwaway, she doesn't use reddit. 

So, I have been living with S for more than one year and about three months into living with her I got myself a pretty nice boyfriend. She asked nicely if I refrain from having sex in our communal areas, those include the kitchen, dining room and living room. We live in a very nice house and we use all these rooms daily. She said the idea of someone having sex in one of those rooms wasn't nice and that because we share the space we should respect it. 

I have no issue with this. Would I like to fuck my boyfriend on the dining room table? You betcha. Would I do it? Nope, not in shared accommodation. I would if it were our own house. 

Last night she had a date and brought him home. I heard them come in, and realised that I needed to go to the bathroom but in my sleepy state I didn't rouse for another five or so minutes. When I went out onto the landing I could clearly hear them having sex in our kitchen. I quickly retreated back to my room without peeing. 

My initial reaction was one of disgust. I'm appalled really. I've respected her wishes and she didn't extend that courtesy to me. Today, I am still pretty annoyed about it but thankfully I have work and so have not seen her. I don't want to over react, but at the same time I feel like something needs to be said. I feel disrespected and I'll tell you now that without doubt if the tables were turned she'd say something to me. 

She speaks her mind, I am (was, I'm learning to speak my mind) the timid one. Any suggestions?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: housemate had sex in kitchen after she explicitly asked me not to do that. I'm annoyed but not sure how I should broach the topic with her.