We take for granted here that the epistemic shock of something impossible happening wouldn't cause any major societal disturbances and that, after a few weeks, everyone would take the event for granted and have gotten used to it.
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Pros:
Vast reduction in misogyny, sexual violence, and possibly even violence in general
Temporarily halted effects of human population growth on climate change, pollution, habitat destruction, and resource overconsumption
Slightly increased global life expectancy
Significantly reduced spread of some STDs
Gynecologists get double the business
Cons:
Sudden approx 18y deadline within which to set up global industrial scale voluntary artificial fertilisation before total demographic collapse of workforce begins
Possible breakdown of many previously stable heterosexual romantic relationships and resulting nuclear families
Mass sexual frustration of people attracted to men
Half the supply of gynecologists relative to population, and androcologists(?) now finding themselves redundant
Honestly kinda tough to call lol
@SemioticRivalry Reproduction would still be possible, through e.g. vitro gametogenesis and sperm banks.