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.
Hair. Hair is one of the characteristics of a mammal that is unique to mammalsâno other animals have true hair and all mammals have hair covering at least part of their body at some time during their life.An individual hair consists of a rod of cells that are reinforced by a protein known as keratin.air. Hair is one of the characteristics of a mammal that is unique to mammalsâno other animals have true hair and all mammals have hair covering at least part of their body at some time during their life.