<human>: Can you summarize the given text in a few sentences?

Hey reddit. I need strangers' words of wisdom because I feel biased talking to friends and family. Apologies for any errors (phone).

I moved in with my bf [25M] this summer in a house with him and his 2 roommates [25M & 25M], splitting rent 4 ways. We have the master bed/bath so sharing the space is not an issue. My bf works from home either in the living room or bedroom desk area while I commute to work. In March one of the roommates starting dating a girl (Karla) and they wold swap sleeping arrangements between her place and our house (she'd be over 3-4 nights a week). She had some housing issues (possible eviction) so the roommate invited her to move in for the whole month of June until she goes back to live with her folks. She isn't working this summer, so I'd saying she is technically squatting.

What is bothering me is a comment Karla made to my bf a couple days ago. He was in the living room working one morning and she approached him asking if he could hear her using vibrater (wtf?!). He said no, and later that day told me about their brief conversation. He is not at all interested in her and I do not think she is interested in him, but her asking him about something that private is weirding me out.

I'm incredibly uncomfortable that she'd even ask, and I'm wondering if my other prejudices towards her are clouding my judgement (she drinks like a fish, smokes cigarettes in their bedroom occasionally, and is addicted to xanax). She doesn't leave the house all day until her bf (roommate) come home from work in the evening. I want to be civil but it's messing with me that she'd day that to my bf when she is in the house with him all day every day.

Please give any input, I want to know if I'm being over dramatic. She isn't leaving until the end of the month & I want to feel comfortable in my own home
<bot>: roommate's new gf moved in for a month, doesn't leave during the day, asked my bf who works from home if he can hear her using her vibrater, I'm weirded out