If you have respect for the act, and what it means, yes. Sex comes with the risk of conception, always, and regardless of where you fall on this point politically or morally or whether you think its realistic to expect from others - each of us individually knows this, and should take some responsibility for it, male and female alike. We're not burning toast here, or spilling milk - we're creating the very fundamentals of human life.
I'm pro-choice but I honestly can't understand how anyone can take this stuff casually once they've put any thought into it. And yes, I'm not talking about rape or incest here - I'm talking eyes wide open, consensual sex. Either we can accept some adult responsibility for what can happen, or else we should take a cold shower because maybe we're not ready.
/rant. apologies.