shneancy knows what they are talking about!

I also want to add that you can try out BDSM stuff without sex. (BDSM doens't even need to very sexual) If you two are unsure about how something feels, pain/comfort-levels etc, try it in a more neutral situation and have fun with it.

Example:

Say you two have talked and are curious about face-slapping.

So you or both start with reading about common damages that can happen (hearing-loss eg), what do to if it happens and tips on how to do it in a good way (hand-positioning eg).

Try it on your self first, how does it feel to slap your own face on different places? Maybe compare with slapping other body-parts.

Then you two get together in a relaxed comfy situation. Start SLOW. Like, a light tap on the cheek. Talk about how that felt. Try slightly harder or change position, angle etc. Explore, slow and steady.

Afterwards, depending on how intense it gets, do some aftercare (for many: cuddles, candy, water, maybe a comforting movie and comfort each other) and let some time go to land in the feelings. Sometimes it takes a bit to process it all.