For scale: Estradiol bottle.

For scale: Injection needle BD SafetyGlide 22G x 1 1/2 (0.7mm x 40mm).

Second anus spread. Note the rise below; this is the second tailbone.

Estradiol bottle gently inserted into the second anus divot. (Don't mind the estradiol patch.)

Needle injected to the hilt into the second anus; not possible on a normal human, it would hit the spine.

As above but from a different angle.

I literally stabbed myself with a needle in the second anus to bring you these images. Hopefully this clears things up a bit.