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.
Some of the things that mammals have are: warm blood most young are born alive every mammal is a vertebrate (has a spine and spinal cord) mammals feed milk to there yo â¦ ung they are covered in fur or some form of hair.here are two egg-laying mammals. The platypus and the echidna are both egg-laying mammals, or monotremes. They are still classified as mammals be â¦ cause they feed their young on mothers' milk-a characteristic unique to mammals alone. There are just three known species of egg-laying mammals, or monotremes.