You may not want to know about this one. It happens when you swallow or breathe in the eggs of tiny worms. They get in your digestive system through contaminated food and things like bed linens, bathroom fixtures, toys, and sandboxes. It’s more common in children. The itching usually happens at night, when a female worm lays eggs around the anus. You may see them in your underwear or in the toilet after a bowel movement. They look like tiny pieces of white thread. If you or your child has pinworms, your whole family may be treated for them.
In animals at least as complex as an earthworm, the embryo forms a dent on one side, the blastopore, which deepens to become the archenteron, the first phase in the growth of the gut. In deuterostomes, the original dent becomes the anus while the gut eventually tunnels through to make another opening, which forms the mouth. The protostomes were so named because it was thought that in their embryos the dent formed the mouth first (proto– meaning "first") and the anus was formed later at the opening made by the other end of the gut. More recent research, however, shows that in protostomes the edges of the dent close up in the middle, leaving openings at the ends which become the mouth and anus.
With anal sex, the anus can play a role in sexuality. Attitudes towards anal sex vary and it is illegal in some countries. The anus is often considered a taboo part of the body, and it is known by a large number of usually vulgar slang terms. The anus is also the site of potential infections and other conditions, including cancer. The traditional polite synonym for anus was fundament, though this euphemism is rarely heard now that medical terms are widely acceptable.
The Mishneh Torah, a text considered authoritative by Orthodox Jewish sects, states "since a man's wife is permitted to him, he may act with her in any manner whatsoever. He may have intercourse with her whenever he so desires and kiss any organ of her body he wishes, and he may have intercourse with her naturally or unnaturally [traditionally, unnaturally refers to anal and oral sex], provided that he does not expend semen to no purpose. Nevertheless, it is an attribute of piety that a man should not act in this matter with levity and that he should sanctify himself at the time of intercourse."
It's important that we talk about all kinds of sex because not everyone is having, or wants to have, "penis in the vagina" sex. If you do have "penis in the vagina" sex and are curious about something else, or are finding that that type of sex is not for you and you'd just like to explore other options, it's helpful to know the facts. Even if you do learn more and decide anal sex is not a thing you'd like to try, it doesn't hurt to have the information.
8. The right lube is twice as important as it is when having vaginal sex, which is already super-important. You might have heard that too much lube takes away the friction that makes it feel good for the dude. That's bullshit. There is no such thing as too much lube, because it makes it feel slightly less like you are using your butthole as a handbag for a flashlight.
The emotional overture I feel before boarding a roller coaster is about the same as I feel right before embarking on anal sex: excitement, followed by mild hesitation and nervousness. But! The thing about every single roller roaster ride I've been on (so far) is that I've loved them all. No matter how many butterflies are tap-dancing on the bottom of my stomach as the ride lurches up a steep hill, the thrill I feel at the end of the ride is always worth it.