10 Pregnancy Superstitions That Are Old Wives' Tales

Conception Position
While certain sexual positions are better for conception than others, none can improve the odds of conceiving a boy or a girl. Angel Herrero de Frutos/iStock/Thinkstock

A lot of people maintain boundaries when it comes to sharing intimate sexual details with family and friends ... until a baby has been recently conceived, that is! Upon learning that a friend was pregnant, I expressed my joy and asked the requisite, "What do you think you're having?" question. Her husband piped up, "I know it's a boy because I was on top the whole time." TMI, right? It was just a visual that I – and probably no one else within earshot – really needed.

According to centuries-old folklore, missionary position ups your odds of conceiving a boy and woman-on-top yields more of the sugar-and-spice-and-everything-nice variety of babe. To date, however, research has not been able to validate this superstition. In fact, the only thing that really makes an impact on baby's gender is whether or not the sperm that crosses the finish line features an X or Y chromosome [source: Adams].

Many experts theorize that deeply penetrating positions, like the missionary position, are more likely to result in pregnancy. Why? Because the penis, and the resultant sperm, are that much closer to the cervix, so less swimming is required to reach the egg for fertilization [source: Genesis OB/GYN]. In fact, the woman-on-top position is less likely to result in pregnancy of any gender because the "boys" have to work harder when swimming upstream [source: Mann]. For the record, I have three boys and we ... wait, that's none of your darn business. Moving on!