Male Turtles have a penis and the female Turtle has a vagina almost like a human and dogs and other animals do.
The male turtle will usually mate with the female turtle while they are in the water.
When turtles mate the male turtle will climb onto a female turtles back while she is swimming horizontally in the water.
The male turtle will then insert his penis into the female turtles vagina and then have sex or intercourse with the female turtle just like a human would have sex and mate with each other.
Basically the male and female turtle have sex with each other just like humans do.
Male Turtles have the penis and the female turtle has the vagina that the males turtle is inserted in.