I did that to someone once. We got pregnant the year after my sister had a child 'out of wedlock' in our very religious family.
Sidenote: If anybody is wondering about all the pregnant christian girls:
1) Abstinence doesn't work
2) Promiscuity is a symptom of molestation. Once I realized that, I stopped sleeping with everything that moved and a few things that didn't.
Any rate - he wanted the baby, I didn't. I got what I wanted, and then we broke up. On the first anniversary of our break-up, he was married to someone else, and expecting a child. And on the second anniversary, he broke his vows with me.
Life is messy, and we don't get do-overs. And we sure as shit don't get to tell other people how to live their lives, from a moral perspective. If sex isn't against the law, it is NONE of your business what two or more consenting adults do. None.