Siblings of autistic children, like those with the condition, tend to have faces that are more masculine than average.

The ‘extreme male brain’ theory suggests that autism is an exaggeration of systematic sex differences in ways of thinking.

Brain waves in infancy forecast autism, people with more autism features have trouble detecting lies, and veterinarians battle claims that vaccines cause autism in dogs.

Adults who have characteristics of autism are about three times as likely as their peers to not identify as heterosexual, homosexual or bisexual.

Masculinized features help define children with autism, online autism-parent forums spread pseudoscience, and the United States has more older fathers than ever.

A new study casts doubt on the ‘extreme male brain’ theory of autism, Americans are worried about gene editing, and a Pasteur Institute clash raises questions about scientists’ age.

Having polycystic ovary syndrome raises the risk of having a child with autism by nearly 60 percent.

An analysis of prenatal screening test results fuels the theory that abnormal levels of steroid hormones in the womb wire the developing brain for autism.

Elevated levels of fetal sex steroid hormones such as testosterone may explain many of autism’s unique features.

The environment’s influence on gene expression can vary by sex and affect autism’s expression.