Myself and girlfriend have been going out for nearly 4 & 1/2 years now. Everything is fine until she talks to me last night. She says that sometimes (lately, like the last 3/5 times) when we have sex it feels "weird", like it's the first time I'm doing it or something. I tried getting her to explain what she meant by wierd but that's as much as I could get out/she could figure out. Thoughts? Could it be she has just lost the attraction to me? I can't see how sex can be weird if you are truly attracted in a physical way to the other person. Has anyone experienced or know of something similar and could provide insights?