Assertion: vasectomy's partner | /r/CapableOf | produce offspring
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text: As a woman's reproductive capacity reduces significantly with age towards menopause, eventually ceasing while a male partner is still able to produce offspring (see Age and Female Fertility), she benefits in evolutionary terms from her partner undergoing vasectomy - eliminating or greatly restricting his ability to mate with other women in the future, thus helping to ensure or protect her partner's investment and resources for herself and any offspring.