Usually sexual anatomy is taught through the lens of reproduction, so it’s only about penises and vaginas, testes and uteri. Seen through the lens of of pleasure, sexual anatomy looks different.
A lot of questions about how to have intercourse, how to masturbate, and worries about what's all going on down there can be solved by simply getting to know your own body. In fact, I'd gander to say that before you let anyone else get to know it, you'd best know it yourself as well as you know your own face.
A short, fast, sex ed summary of basic sexual anatomy.