I've noticed a couple of girls who have pics of themselves with their hands tied at the wrists, or maybe their ankles and knees tied, etc. But no one seems to talk about this sort of thing as being on offer, and I haven't come across any reviews that mention being tied up.  

I guess what I'm wondering is, does anyone really do this, and how well would a girl need to know her hobbyist before agreeing to this sort of thing?