Are some sexual positions better than others for conceiving?

http://www.babycenter.com/6_your-pregnancy-2-weeks_6000.bc

There's no evidence that any particular sexual position is more likely to lead to conception. You may have heard that positions which deposit the sperm closest to the cervix — such as the missionary position (man on top) — are more promising than other positions. But there are no studies to back this up.