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genetics

Study finds relationship between bisexuality, risk-taking, and fatherhood

However, the findings are proving rather controversial.

Wash. GOP Senator: Gay Is 'Genetic'

Washington state senator Dale Brandland, a Republican from Whatcom County, says his belief that people are born gay motivated him to vote in favor of expanded domestic-partnership rights for same-sex couples on Tuesday.

Sperm Donor With Genetic Condition Doesn't Tell Lesbians He Contacted

James MacDougall fathered 15 children without telling the women using his services that he had fragile-X syndrome.

Can Your Genes Explain Sexual Orientation

Genetic testing can explain many things. Is your sexual orientation one of them?

WATCH: Rick Perry Knows He 'Stepped In It'

After the Texas governor made national headlines for claiming one can be genetically predisposed to homosexuality, like alcoholism, he's been scrambling to walk back the statement.

Scents and sexuality

This spring's breakthrough study on how gays and straights respond differently to human smells is only the latest in a long line of studies suggesting a genetic link to sexual orientation