Aries and Taurus are a mix that is at the beginning compatible in its sexuality. Both are signs that enjoy sex.
But then, a lot of personality differences begin to creep into the relationship. To begin with Aries is headstrong and impetuous. And likes to lead. And likes to venture forth.
And Taurus is stubborn and deliberate and likes the quiet life and a comfortable life. And so their ways start to part.
Another difference between them is that Aries wants to be the one to call the shots, give the orders, control the situation. And Taurus won't take orders. Taurus is very clear in what he or she wants. And Aries and Taurus don't want the same things.
So, in general this is a combination where the personality differences are going to rear their heads as you get into the relationship. Whereas at first it seems like a very sexy passionate pairing.