"Female Viagra" sounds like it ought to be a story about desire — a tidy mirror image of the men's pill. But the most genuinely surprising place sildenafil has ever turned up in women's medicine has nothing to do with libido at all. It's in fertility clinics. And in a handful of cases, it has quietly helped bring babies into the world.
The Lining That Has to Be Just Right
For an embryo...
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