36 facts tagged with Sex Facts
When flatworms mate, two "males" use their bifurcated penises to fence one another. The winner, or the flatworm who stabs the other with its penis, remains a male while the loser becomes female.
Romans used a plant called Silphium as contraception. They had so much sex that they drove it into extinction.
Oral sex was illegal in 18 states under old sodomy law until 2003 when they were invalidated.