Contraction The on-again, off-again tightening of the uterus during childbirth, which causes intense cramping. Related Articles: How Sex Changes After Pregnancy & What You Can Do About ItWhat will change with a woman regarding her post-labor sexuality? Research on breastfeeding and sexuality has been taboo in the past, but, thankfully, this is changing.Breast Practices: Pleasure, Health, and MoreNipple stimulation can mimic the same action and chemical response in the brain that's caused by genital stimulation. Sasha Co- Founder of Psych n Sex, previous writer and campus educator for the Kinsey Institute & published psychology researcher. Manhattan girl obsessed with post ww2 abstract expressionism, beet juice, vintage clothing & Scandinavia.