Pegging, defined by Dan Savage as the sexual practice in which a woman penetrates a man's anus with a strap-on dildo, is taboo. It's an eventuality surrounded by incredulity. Many gay men look suspiciously -or with hope- at straight men who like to be penetrated.
What two characteristics make mammals unique from other vertebrates? Mammals are unlike other vertebrates in two distinct ways. First,  all mammals have hair, unlike other vertebrates. Also, female  mammals carry their offspring to full term â¦in the uterus, whereas  most other vertebrates lay eggs.
The official definition for the word mammal is a warm-blooded  vertebrate animal of a class that is distinguished by the  possession of hair or fur, the secretion of milk by females for the  nourishment of the young, and the birth of live young.. Mammals are warm blooded. They also have hair or fur.