>>2998426Well for one, a flat-chested girl isn't really a girl at all if it's at least 16 or 17.
For another, a lot of trap artists just get lazy or can't draw androgyny well. Many of them draw the important areas, that is, the hips, waist, chest, and shoulders, like a female hourglass. Some trap artists know how 2 proportions right though.
The other areas of the body are variable enough IRL though that it's more than possible for a guy to possess them, but generally speaking you won't see a dude with anything resembling an hourglass which is where most trap artists screw up. A trap is not supposed to be just a girl with a penis, that's what shemales were invented for.
Also IMO it's not a trap if he isn't cross-dressing, no matter how pretty you think he looks. That's more a type of bishounen than anything else.