Lisa Fullam has a terrific summary at dotCommonweal on the basics of sex and gender. It rubs against the Gospel of ToB, but largely seems to be spot-on with what I’ve learned about people. Predictable hand-wringing in the commentariat about the Hermeneutic of Gender Complementarity, but I ever found that principle particularly convincing beyond the realm of wishful thinking.
Pope Francis seems not to be on board about all this. No biggie, in my estimation. The Temple Police are all over him for talking to and hugging a trans person the other week. Not sure: I don’t follow these stories deeply.
Anyway, good summation on the link.
Catholic Sensibility 
The “hand wringing” you identify is simply posters who point out that Ms. Fullam’s article is full of metaphysical assumptions that are questionable.