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.
Reptiles, like turtles, have no fur or hair. Their skin has scales. Other characteristics of reptiles are: They are ectothermic vertebrates.They have three-chambered hearts (except for alligators and crocodiles, which have four-chambered hearts).They have claws on their toes (except those which do not have legs, such as legless lizards).heir skin has scales. Other characteristics of reptiles are: They are ectothermic vertebrates. They have three-chambered hearts (except for alligators and crocodiles, which have four-chambered hearts). They have claws on their toes (except those which do not have legs, such as legless lizards).