Honestly, the world knows no need for such a thing.
The QoS exists as a means for Women to advertise their interest in Black men.
But it`s a man`s "task" to approach her, if he finds her attractive.
What do you think is the proper definition/description of a "Bull"?
Someone who gets himself tattooed and waits for the ladies to make advances to him? - Most definitely not!
Other than this...
If you still stick to the idea of a "Bull tattoo", here`s an idea:
Of course this would need some adaptation, because it`s copyrighted work done by some designer contributing to
CafePress. T-shirts with this motive can be found
here.
Why this would be a good choice for the proposed purpose is that for a Black man showing a tattoo similar to the above motive it would be clear he is identifying with the bull and not the rider while the overall message is clear enough, even well-known to many women who are either already inside or only curious about a QoS/"IR" lifestyle.
But as i said above, i don`t see a real need for a tattoo as a lifestyle symbol to show the ladies.
?!