How to make screen 'unsensitive' on incoming calls?

Here's the scenario: what I often find happening is that I receive a call on my Android phone (HTC Desire S), and as I'm rushing to get it out of my pocket I'm accidentally managing to swipe the screen, which rejects or accepts the call, when I didn't want to. What's the best way to avoid this, given that I want to keep my phone in my pocket? I'd kind of like the screen to remain disabled when a call is being received until I press the power button at which point it becomes sensitive. Is there a way to do this or something which would avoid this accidental accept/reject of calls?