Sex positions to avoid: Although no positions are technically unsafe (other than those that have you flat on your back), some women don't like the feeling of very deep penetration. And while a recent goodpublications.info poll of pregnant women revealed that back-door sex was suddenly very enticing, tread carefully. Sex is usually safe. If you do want to have sex, embrace the ubiquitous three-word Nike slogan. As long as your pregnancy is progressing normally, you can have sex as often as you like (some exceptions may include a history of miscarriage or preterm labor). If it's safe for pregnant people to have orgasms, it's safe for them to have exciting, heart-pumping BDSM sex. Heck, Serena Williams continued to play tennis throughout her pregnancy — and that surely raised her heart rate, but baby Alexis was % fine.