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sex by male and female In placental mammals, the presence of a Y chromosome determines sex. Normally, cells from females contain two X chromosomes, and cells from males contain an X.. Get instant access to every 18+ video and photo—subscribe to our Telegram channel today! Sex generally refers to an organism's biological sex, while gender usually refers to either social roles typically associated with the sex of a person. sex by male and female Unlock an exclusive collection of adult content on our Telegram channel—join now and never miss a thing! Use the "open" button to become a subscriber and keep in touch with our amazing community. Your gateway to the ultimate collection of steamy adult content is just one click away! Sex is a label — male or female — that you're assigned by a doctor at birth based on the genitals you're born with and the chromosomes you have. It goes on your.