>>33557962 (OP)
>What are the downsides of birth control for women?
All forms of birth control have side effects - condoms, for example, reduce male sensitivity. In many cases the side effects are minor enough that using it is a good trade off. In some cases the side effects may be actively beneficial: one of my exes, for example, had a hormonal IUD, and it had the effect of shutting down her periods completely, which she loved; another was on the combination pill for a bit, and found it boosted her sex drive, improved her mood, and made her periods lighter and less painful. My current partner has a copper IUD and finds the side effects negligible.
But of course sometimes the side effects are bad. The progestogen-only pill, for example, can cause low mood and loss of sex drive. Each woman needs to experiment with a few methods and determine the pros and cons for herself.