I'm slightly concerned by the number of people in this thread saying "they have to do internals" - no, they don't. Like pretty much everything in labour, it's totally your choice. There's a whole thread in Natural Birthing about internals and why they aren't necessary if you don't want them. I had one, at my request, to know how far along I was before I got in the pool, and no others. I pushed when I felt like it (which wasn't until his head was crowning infact, the contractions worked perfectly well to move him down the birth canal without pushing). OP, don't worry about being blunt, I expect they're used to it since if I was anything to go by women in labour aren't generally the most tactful! It's perfectly polite to just say "No, thank you," or even just "No". Avoid peppering it with swear words (unless they try without your consent, at which point it's assault and all bets are off!) and I'd say you're fine. I agree with PPs that you should put it in your birth plan and make sure your birth partner knows.