Even if there was a safer way, I wouldn't encourage this kind of act. Not because of the moral implications necessarily, but because ANY risk is too much. Common sense should be used with this information we're providing, and I hope it is.
Because its all well and good until you've killed your partner... 🙄
EDIT:
And if the cops get involved what the hell are you going to do and say?
"Officer, I swear! We were just roleplaying and wanted to try this stuff out! Some online friends told me it might hurt her, or worse, but I just couldn't help myself! I throw myself upon the mercy of the court!"
Yeah, things wouldn't be looking very up for you right about then... 🙄