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.
Primates are an extremely diverse group of between 190 and 350 living species, depending on different taxonomic structures, and exhibit a wide range of characteristic features that help distinguish them from other mammals. They range in size from the 2-ounce pygmy mouse lemur to the 440-pound wild gorilla.ther Characteristics. Other primate characteristics include having a nail on the first digit although, in many cases, each digit has a nail instead of a claw. Primates also possess a clavicle, or collarbone.