A medical study found that women who gave their men oral sex and swallowed had a lower risk of preeclampsia, the dangerously high blood pressure that sometimes accompanies pregnancy. [https://www.ncbi.nlm.nih.gov/pubmed/10706945 ]
If you’re experiencing normal or increased desires, sex and masturbation shouldn’t be an issue during a low-risk pregnancy. Your doctor will advise you on whether vaginal penetration and orgasm are a problem. [http://www.healthline.com/health/pregnancy/ma