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.
Brain. The brains of primates often is one of the most distinguishable characteristics from other types of mammals or animals. The olfactory region in primates has been reduced greatly in most species, such as humans, and the cerebrum expanded to accept the order's increasing reliance on sight and social behaviors.ther 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. All primates exhibit the tendency to be erect; this trait is visible when even quadrapedal primates sit or stand.