Cum inside?

If your SO had a vasectomy almost 7 months ago and his semen sample is FREE OF SPERM, would you go raw and let him finish inside? I keep seeing people say they wouldn't and they would use condoms or another form of birth control..but a vasectomy is one the most effective ways to prevent pregnancy. It's 99%. The whole point of a vasectomy is so no pregnancy will happen. Anyway..would you go raw and him finish inside?