I love this poem (not my composition) 

What is this kind of love?
How does one find its meaning?
Where pain and pleasure meet,
And become one.
Where a man controls,
Her every breath.
And she submits so willingly.
It is something,
No one can define.
No one answer suffices.
Except!
That in all ways,
It is the purest love.
The meaning of trust.