Anal sex is another category of sex where it's advantageous to not be porn educated, where the pizza guy gets to the door and is in there in under two minutes. "They don't see the behind-the-scenes porn magic," says Stubbs. "The stretching. The getting-the-anus-ready-for-sex." The anus is a lot tighter than a vagina and doesn't not lubricate naturally. Therefore, anal sex takes some time.