Who would you assume to be more possible to father a child? A man with a vasectomy for 10+ years or a man with no vasectomy that used the withdrawal method?
Unusual question. Vasectomy, if successful (((% are) means that no sperm escape with ejaculate. Sperm aspiration by needle or vasectomy reversal would be required for insemination. Withdrawal method is totally unreliable as sperm can enter vagina in pre-cum which occurs before ejaculation (climax) ; without sensation. Thus withdrawal method frequently results in pregnancy. Post vasectomy pregnancy occurs rarely.