Sex to induce labor

How effective is it?😅 I’m 38w+2 and we are just getting impatient to meet baby girl! Our first came at exactly 38 weeks so idk we are just excited! How effective is it? I’m 3 cm dilated already and 70% effaced! We’ve held off from sex for probably a month now because I wasn’t prepared (didn’t have clothes and such) but we are so ready now!