This story of the pregnant "man" hasn't materialized in a vacuum.
The news out of Texas last week was of the police raid on a polygamist compound in which underage girls have been forcibly "married" to abusive older men. From Australia came word of John and Jennifer Deaves, the 61-year-old father and his 39-year-old daughter who have had two children together and pleaded guilty to incest, but say they just want "a little bit of respect and understanding" for their illicit relationship. These are only the latest in an endless series of reminders that sexual urges and appetites can be powerful and perverse and lead to harmful consequences. That is why human societies have always constrained sexual behavior with equally powerful taboos and moral standards.
Increasingly, though, anyone who upholds those taboos and standards is denounced as a narrow-minded bigot, while those who defy them are celebrated for their nonjudgmentalism and tolerance.
Gee, how could we possibly think you're a narrow-minded bigot for comparing transgender people to a cult of child-raping fundies? I mean, you didn't provide any evidence whatsoever that the relationships you're so damn afraid of actually "lead to harmful consequences", nor is there any evidence in fact that that's why human societies have constrained them.
And you know, it's pretty ironic that you're talking about how societies have "always" had these sexual taboos to prevent older men from forcibly marrying younger women when, say, polygamy is far more traditional and popular than monogamy, the marriageable age in the past was much younger than it is now, and arranged marriages were (and in some places still are) the rule rather than the newsworthy exception.