No, we give better head because we realize that genitals are actually remarkably similar. Clits are basically tiny dicks. Each has sensitive spots in similar areas. Practice on one can translate to another. Its not rocket science, its phallic science borne through watching a lot of wild surgery videos and analyzing post op results to determine nerve sensitivity :very-smart:.
Also hrt makes your tongue 3 feet long :shrug-outta-hecks:
I don't think so. Guys have a variety of preferences, some of them don't want bee jays at all, some don't want the tongue piercing ball in the pee pee hole, others demand it.
Probably the only reliable predictive indicators of besus quality is going to be a mix of experience, enthusiasm, and communication.