For humans, sex serves the dual purpose of pleasure and reproduction. But both of these natural processes no longer enjoy their once predominant exclusivity. Sexual pleasure faces stiff competition from all sorts of artificial gadgets. Science is already advanced enough to negate sex as a means of reproduction. And men's contribution is the easiest to discount, slowly making men irrelevant.
Let's start with reproduction. Artificial fertility treatments already achieve pregnancy rates that easily surpass natural conception rates. The limiting factors are the high levels of interventions and costs.