No need to concern yourself with which is the toy, as long as you both enjoy each other.
Female on female is version one, and female on male is version two. They'll need their respective versions to work properly. Models has been tested on Miqo'te and midlander (version one) and Miqo'te and Au Ra male (version two) only but should work with other races with slight adjustments. Minor clipping will happen with the models eating her out.