Mary F. Pols, the author of a controversial new book called "Accidentally On Purpose" lives in Northern California with her 5-year-old son and admits that she got pregnant "accidentally on purpose" after having a one-night stand.

According to 39-year-old writer Kate Spicer, Pols is far from alone. "More than half of all conceptions are outside marriage, for a start," Spacer points out. "Couple that with the fact there has been a sharp increase in the number of children born to those in the 35-39 age group, and you get the picture." Spicer admits that she too has played a game of fertility roulette, although she insists that she's selective about her partners.

We're fundamentally against tricking a guy into fatherhood, but if a man chooses to sleep with a woman he barely knows without using birth control, does he deserve what he gets? And what if you're not necessarily trying to get pregnant, but you are open to the idea -- do you have a responsibility to tell your partner that you're rolling the conception dice?