I think she said it to make you uncomfortable... Yeah, she may want to have a threesome, but the purpose of the comment was to tell you to not be so loud.... I must say though, if you were loud enough for her to hear you at night, without her hearing aids, you're either really pleasing your girlfriend or she's faking it in a big way. Hopefully, you're just really good in bed.

That's uhhh.......kind of disturbing