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Am I only able to have sex without emotions?

Anonymous asks:

I have no reservations when I have casual sex. However when one of these flings turns into a relationship and things get serious I don't want to have sex with them anymore. It has happened with my last three boyfriends and has been the primary reason for my breakups. It feels like a normal relationship...we are best friends, we do almost everything together, I care about him tremendously, but I get scared when he wants to have sex. Why can I only have emotionally detached sex?