What would you do if your SO revealed that she/he was very much into BDSM and kept asking you to hit her/him [to the point of bruising]?
Enter into as binding a notarized agreement as I can, with very explicit terms, to as near as possible protect myself from legal consequences. Then try to do it in as safe and controlled a manner as I can, if that isn't acceptable than no bueno.
Retrospring uses Markdown for formatting
*italic text*
for italic text
**bold text**
for bold text
[link](https://example.com)
for link