I can't have sex with my SO , better alternative

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So me and my SO don't live together. We've been working on that it seems our entire pregnancy and everything just keeps falling through. Anyway since he works I see him only once or twice a week sometimes three times on a good week. I heard sex is a great way to start labor and being 38 weeks tomorrow I'll do anything. I mean I drank a cup of hot sauce. So I was wondering if you guys thought masturbating is a good alternative? Would it work the same?? I mean I can do that 3-4 times a day but actual sex is nearly impossible these days.