sex and labor? TMI

Maleah • 21 year old Mama of a beautiful girl. She will be two in Dec 2018. Currently hoping on baby number 2!
Moms who have babies already. Did you start having sex when you were full term and did it put you in labor? I heard sperm can soften your cervix and having an orgasm can bring on contractions. What are your stories? How often did you have sex to make this happen? When did you go into labor? I'm asking because I'm 35 weeks and plan on starting a few things when I'm full term!