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.
Distinctive features. 1  The apparent lack of body hair immediately distinguishes human beings from all other large land mammals. 2  The characteristic features of skin change from the time of birth to old age. 3  Human skin, more than that of any other mammal, exhibits striking topographic differences.