If a male birth control with few or minor side effects is introduced to the market the birth rate will plummet to virtually nothing.
Because most children are unwanted? Seems like projection.
Look at what birth control does to birthrates when women have it as a viable option, if men have something equally effective you now have a scenario where you have two people at the same time with the ability to drastically reduce pregnancy, despite your childish insults my observation was just envisioning the math, so calm down bro.
I wouldn't assume there's this great untapped population of couples that are currently not using any form of contraception at all that would start doing so if xyz. For the vast majority of couples the choice would be one of contraceptive method of preference, not of contraception versus no contraception.