The following are biological facts:

Sex is binary.

Mammalian cells have a sex (M/F).

A much longer thread than usual based upon a recent Q & A regarding the importance of Sex in Medicine.

So, let’s begin.
Why are there more boys with autism spectrum disorder (ASD) than girls?

Because every cell has a sex.

Note: this takes into account any potential under diagnosis of girls or over diagnosis of boys. More boys are diagnosed with ASD=fact.
Why was the drug Zelnorm (Tegaserod) only approved for women by the FDA for IBS?

Because every cell has a sex.
Why are women more likely to be adversely affected by a traumatic head injury (TBI/mild TBI) than men?

Because every body has a sex.
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