Well it’s technically a ruin but they can still feel really good, especially if you do it by accident. I tend to find it really varies. However, if you deliberately ruin some orgasms, get really close, especially fucking yourself too, and then pull out hard and stop as you go over, it’s a far more brutal ruin.
And, many report that once your body has learnt a hard ruin like that, even the accidental ones get worse.
The fact this turns you on means you should try it.