This isn’t a moral question, it’s an inevitable emergence of sexual selection.
Put simply - what happens when the male has so much less to lose physiologically than the female? Whether we like it or not, the male doesn’t have to care which and how many females he impregnates - the physiological cost of doing so is negligible. Men who do so carry on their genetic pre-disposition to act in the same way when exposed to likely similar enough environments (behaviours) so much more successfully. The men who don’t, they get progressively outnumbered until they are pushed out. Why should they care about birth control beyond their own capacity to feel guilt, love for their offspring, and social mores? This is why stud = good (and why females that are attracted to that type are so prevalent).
What does a female have to lose physiologically when she is impregnated? Even if it doesn’t last there is significant physiological cost to her, which only increases further into pregnancy, through giving birth and even more so into investing in bringing up the child. It is absolutely necessary for her to care and take control of her birth control. The ones who don’t are much more likely to end up with lower quality genetic material going into their child, and they are much less likely to keep the male around to help bring up the child, making the child less likely to carry on the mother’s genetic pre-disposition to act in the same way when exposed to likely similar enough environments (behaviours). This is why slut = bad (and why most males are not attracted to that type).
The physiological consolation is that women pass on more genetic material to their offspring than males, and they are more socially prized as they are less expendable when it comes to the continuation of the society. Societies that don’t prize women risk this and get outnumbered until they are pushed out. A modern day psychological consolation is that you get to be in control of birth control now we have it. So despite the above, it’s really not a bad lot to be a woman.
Birth Control reduces accidents to a degree, which is a huge empowerment for women: it enables women to get more experience with identifying who is compatible with them for child rearing (along with the ability to try out less “long term” experiences). But this is actually worse for lower quality men, who don’t get to pass on their genetics by accident or through ignorance of other available choices, and way better for higher quality men who get to have way more no strings attached sex whilst still being selected for childbearing if they woman so chooses to come off Birth Control, and still passing on their genetics when the less common accidents do happen.
The social consequences of things worsening for lower quality men are bad for everyone though - but at least overall it’s a net gain.