Hydra recognises that rigid conceptualizations of gender roles are limiting. Or at least, that's the line the experimental biologists are happy to sing if anyone asks them why they want to implant a fetus into the Asset's abdominal cavity. He's the perfect initial subject: unlikely to bleed out if something goes awry, he's not going to commit suicide, and hydra scientists aren't burdened by the pesky sort of morals or norms that inhibit their less fortunate contemporaries.