Actually, it doesn't necessarily knock you out. I mean I have been prescribed it and have never felt knocked out. Anyhow, it is rather easy to become addicted to since it acts at the same receptor that alcohol does. It relaxes you in a similar way. You also can gain quite a tolerance toward it.
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"I always find it funny when chicks say that, because I hate sex but I still have it. Afterwards, I hate myself, I feel awful, dirty and sometimes cry. But it's worth it, if only to feel a little human every now and then."