Yes, with my ex several times.
We lived with housemates, so when we were home alone he would want to make the most of it.
He would tie me face down, spread eagle on our bed.
He would begin to whip my back with a belt. He would rarely count, and was quickly in too much pain to know; but it must of been at least 50-100 strokes.
When I was beginning to sob, he would turn the belt around and hit me with the belt buckle.
These would be much slower, he would give me time to howl and scream between hits, and would do no more than 7-10.
I would be crying for some time afterwards, and my back covered in bruises.
Often, my butt, ribs or upper arms had some too from missed blows.