Oh look, more Japanese superstition that having sex while pregnant can somehow be harmful to the baby. Hint: It's not. In fact, sex during pregnancy is beneficial and can safely be done until the last week of pregnancy. Also, during pregnancy, more blood than normal flows to a woman's privates. Plus, pregnancy releases all kinds of hormones into a woman's body. In other words, her pussy and clit get swollen from increased blood flow, and she feels hornier than usual, resulting in sex feeling even better while pregnant.