6 weeks. We usually recommend 6 weeks, but this is based on very little real research. Once bleeding has stopped and the incision is no longer too tender, gentle sexual activity is fine. Some new moms tell me that they felt ready for sex sooner after a c-section than after a vaginal birth, as they had no stitches from a tear or episiotomy to cause vaginal discomfort. This varies a lot amongst new moms.