To be clear: when @jk_rowling says that MTF trans are not women she is simply stating the scientific definition of sex. Biological males produce small gametes (sperm); biological females produce large gametes (eggs). MTF trans cannot produce eggs so by definition are not women

Exceptions to the definition do not gainsay the argument: young boys do not produce sperm yet, but the potential is there. Girls are born with eggs but don't release them until puberty. Anatomy & physiology of bodies develop around gamete potentiality or actuality; much follows

Add ons like breast implants or reconstructive surgery to turn a penis into a vagina does not turn a male into a female because the body doesn't make eggs. If activists want to redefine sex into whatever a person self-identifies as then biological "female" & "male" is meaningless

And none of this has to do with the rights of self-identified trans people who should share the same rights as everyone else, not discriminated against, protected from violence, etc. It is not transphobic to state a scientific definition. Activists can try to redefine sex but...

that doesn't mean we must accept it. Language matters & thoughtful communication & debate depend upon agreed-upon word meanings. So much of the unwarranted attacks on @jk_rowling is the result of activists redefining terms with which few people (especially biologists) agree.