I wouldn’t wish immortality on anyone. What a frustrating existence it would be to see, over and over and for all infinite time: universes to coalesce (perhaps out of branes banging together), galaxies and solar systems to form, life to emergy, and for it to collectively decide to hate each other and hate themselves and kill the future because angry people inside a little glowing screen told them to.
All dudes have boobs. They have nipples and breast tissue. They can lactate (small amounts) and get breast cancer.
This is because, in mammals, the default sex leans towards more female. An XY-chromosome ‘male’ foetus that doesn’t respond to androgens in the womb will not develop male external genitalia, and will probably be assumed to be female on birth.
Sex is not binary, because biology isn’t simple. Gender, which is more complex than that, is not, either.