Looking to explore the possibilities?  This Beginner's Silk Rope Kit from Sportsheets is a good way to start.  These soft, silk ropes are designed to hold a knot without leaving marks and burns (unless you want them to).

*contains 2- 6foot long lengths of silk rope

*inner booklet shows diagrams of simple knots

*recommended companion purchases: Two Knotty Boys Showing You the Ropes, safety scissors

Always obtain your partner's consent before engaging in any activities involving restraints...once you have it though, the possibilities are endless...