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It is called a dewlap. They use it to attract the opposite sex and intimadate other males as well as some predators.
sex
Males will get a dark ring around there neck and females will get a very light one.
If you look on the rear part of the underside of a crab it has a kind of flap. In the male (jack) this flap is narrow like a "v" shape in the case of a female (jenny) it is wide and more like the shape of a "U".
Kissing neck or nouge
You can determine the sex of a mockingbird by observing physical characteristics — males tend to be slightly larger and have longer tails compared to females. However, the most accurate way to determine the sex is through genetic testing or observing mating behaviors during breeding season.
in between the bones in the wings the female chicks have a flap skin in between there.
A guy sucking on your neck just means he really likes you and he wants to have sex with you.
A male snake will have spurs near the end of his tail. If you look closely you can see two small little flaps near the end of his body. A female only has one little flap down there (lacking spurs)
Kiss her neck,rub her clit,finger her,tell her u love her,cum inside her,shove it in,moan yourself,squeeze your penis and ya all that stuff
What does your gut tell you?
Kiss his neck, just below his ear.