99% effective is nowhere near 100%, perhaps counterintuitively. Sex twice a week for a year and you're probably in deep shit.
Futurology
Bro, are you seriously against male contraception? The pill has failure rates of 9 friggin' percent of typical use. 99% for typical use would be amazing.
If you combine it with the 99.9% (made up number) of condoms then you are pretty damn safe tho.
Or just the wrong hole at the wrong time.
I'm skeptical. Anything targeting signalling pathways seems likely to have consequences that aren't apparent from animal trials. I remember a few years back that MENT (trestolone, 7α-methyl-19-nortestosterone) was being investigated for use as male contraceptive, and one of the biggest issues I recall was that it caused really wild mood swings in a number of men. Admittedly, MENT is hormonal, but I don't think that issues it caused were anticipated; I think the profile looked much more promising than it ended up being.
I was already considering hitting up my fwb who has a breeding fetish tbh. Now I'm def gonna quit doomscrolling and [REDACTED]