(progestins work on male cats just as well. i mean, progestins work on male *humans* just as well, but they cause erectile dysfunction, so for some reason they don't sell like hotcakes. with that caveat, male oral contraceptives already exist and work)
so the idea here is that while you're continuously on contraceptives, endometrium grows (though slowly) and at some point it can't grow any more without shedding. it'd shed by itself but making a pause makes it faster. with an IUD or an implant you can't make a pause so there's…
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no choice in the first place. these things aren't a hard rule, just what seems to work best, and fairly individual. find out what's better for you and follow that.
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oh, now it makes sense. thanks!
End of conversation
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