I am heterosexual and I definitely see the difference.
... I'm not sure I'm buying this.
Ba careful there mate! In many countries it is illegal to pay a prostitute!
... when they find some use for quarks...
In quantum world all particles are in superposition of being both useful and useless. You cannot determine usefulness of a quantum particle without measuring (and destroying as a result) it.
There is nothing so easy but that it becomes difficult when you do it reluctantly. -- Publius Terentius Afer (Terence)