I've always thought cocksucker was used to belittle the man's masculinity like most other homosexual epithets.

I have also used it in traffic to denote that the person in front of me is probably too busy giving or recieving oral sex to know how to drive properly.

Maybe I am jsut jelous since it has beena good long time since I have ever recieved oral pleasure, and it may still be years to come before I recieve any again.

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Well sir that seems to be someone else's problem.