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Across cultures, most people are heterosexual and scientists do not know the exact cause of sexual orientation. It is thought to be caused by a complex interplay of genetic, hormonal, and environmental influences, and not as a choice. Straight sex has always been a staple of porn long before bisexual and gay/lesbian XXX videos gained popularity. ''heterosexual'' Search, free sex videos. This menu''s updates are based on your activity. The data is only saved locally (on your computer) and never transferred to us.