Safe sex positions when pregnant

Is it safe to have sex during pregnancy?. Sex During Pregnancy: Positions, Safety Advice, & Sex Drive. Instead, try positions that take all pressure off the uterus: on top, side by side or from behind. Breast stimulation, female orgasms and certain hormones in semen called prostaglandins can cause uterine contractions. Plus, it lets your partner do all of the work, which can be a bonus if you're exhausted from, ya know, growing a human being.