My girlfriend never wants to have sex anymore?

We used to have the best sex that I've ever had, but lately she's been invariably asking me to stop in the middle of it, claiming to be "too tired." Am I doing something wrong? I've asked her numerous times if she wants me to change anything, and she always says no. Is she just not attracted... show more We used to have the best sex that I've ever had, but lately she's been invariably asking me to stop in the middle of it, claiming to be "too tired." Am I doing something wrong? I've asked her numerous times if she wants me to change anything, and she always says no. Is she just not attracted to me anymore, in which case why does she still tell me she loves me/want to be in a relationship with me?
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