I practice handcuffing with my partner quite often. I find it most arousing. I bought them at
https://obsessharness.com/handcuffs-bdsm/ and there's quite a large selection. I'll even say this, the handcuffs have helped my partner and I become closer. We hadn't practiced something like this before, but once we started, it was like we were getting to know each other all over again. Words cannot describe my feelings and joy. It's very cool.