needles don't necessarily involve blood, most of the time there isn't a single drop, i guess i had a few hundred so far and never bled more than a drop maximum apart from having them stuck in my nipples when they were tightly bound but that was the pressure that made it bleed, usually it doesn't bleed at all. but am still scared to death of needles.
and i told SN lots of times that i wouldn't ever do knife play