Can anyone recommend a good book about the evolution of sexual reproduction? [more inside]
What is the evolutionary relevance of PMS?
Why do humans and animals(?) urinate from their sex organs? Are these two bodily functions in some way related? Are their examples of animals that pee & have sex with parts of their bodies that are spaced far apart? [more inside]
How did we evolve separate genders? I assume it happened pretty early on, since most animals have a male and female, but wouldn't it have had to happen to lots of things at once for it to actually work?