Earlier quoted context omitted.
You're right in that holding a position that is extremely divergent from the consensus view is an interesting place to be. I don't know if that necessarily follows that having a "fair" debate is impossible. There's nothing unfair about a majority of people disagreeing with you. Objective truth isn't determined by majority vote. It is unfair to say "you're the only one who thinks that, so you must be wrong" but I don'…
I'm thinking more of those who fall prey to the argumentum ad populum, and inspired with that confidence, they cite respectable-looking sources and consider them to be irrefutable proof. These people always win their arguments.
The best that you can hope to do is make a new and interesting point that will resonate with someone. Don't be afraid to do that. Even when you're wrong.
You're totally wrong on the contraception thing, by the way :)