This is very true - and it was something I had to learn over time. A couple of times I must admit that I was thinking to myself "okay, one more, I can take one more..." and then another and another and another...and those were some of the times that I felt the closest to Him.
But it definitely made things more intense for me. And knowing that He expected me to use my safeword if necessary was indicative to me of His trust in me...and as a result I trusted Him even more. It was a lovely cycle.
And I did use my safeword a couple of times. And He did honor it...and I didn't feel like a failure. A gift He gave to me - that understanding.