I love the unsaid difference between sex and gender. <3
I initially rolled my eyes when I read the premise of Matydos' short story Lewd Experiment with Asterion of a sex change, but it took me by surprise with how really well written it is (and really hot.) It's also just sex as in genitals, Asterion is still very much a man and identifies as such even with a vagina. I don't see it as that much different than changing a character's genitals to have a hemipenis or more anatomically correct to their animal base. As long as they're still men and down to have fun in their own ways (romantic, sexual or otherwise), it's all good as long as it's unapologetically and shamelessly gay.