Why are we still waiting for a male contraceptive pill?

Despite research into a male contraceptive pill starting around the
same time as its female counterpart, no product has ever made it to
market. But that could soon change, with a new non-hormonal male
pill entering human trials in the UK late last year. Ian Sample
speaks to bioethicist Prof Lisa Campo-Engelstein of the University
of Texas and Prof Chris Barratt from the University of Dundee about
why male contraceptives have been so difficult to develop, and what
kind of options are in the pipeline. Help support our independent
journalism at theguardian.com/sciencepod