my boyfriend tied me to a bed with a slip knot so I could still move my arms but be restrained at the same time, im usually really insecure when it comes to sex so being tied up made me very nervous with my ex ( even though I was still into it ) but my new boyfriend made it feel really safe and like I wasn't having all control taken away, even though he could tighten the knot and take away the mobility. idk, it was just a great experience.