She's got a brother. Being siblings, the photos of him as a boy look akin to her. It's a stupid conspiracy theory to weaken him, feeding on transphobia.
It may be because many countries defines rape as a penetration by an alien body part or object, so as in a F on M rape it's not the case, it's does not qualify as a rape by law. Some countries changed their laws accordingly.
As any men who got through puberty know, a dick can become erected without willingness. Same thing with morning wood. There's partly something mechanical in its reaction to rubbing. As far as I know, its the same than with the woman's body, that's why some raped womens actually felt pleasure, which traumatise them even more.