Blindfolds are an easy, cheap and accessible way of exploring erotic sensory deprivation. Everyone knows how much we rely on sight and eye contact to communicate and to have that taken away can heighten all your other senses. When you're blindfolded you try to guess what is going on around you from just sound and touch, and the 'blindfolder' has complete control over what you experience and can tease or reward as they wish. Whilst blindfolds require you to trust the person you're playing with, they are a safe way to explore your kinkier side.
One of the most exciting erotic experiences I've ever had involved checking into a hotel that had been booked by a man I met online. I let myself into the room, left the door on the latch and blindfolded myself. He'd watched me check-in and a few minutes later came into the room and kissed me. We'd seen each others pictures, yes, but it's not the same as seeing someone face to face - the intensity of that kiss, with a relative stranger, is almost impossible to describe.
(I'd just like to note, I like everything I do to be safe. Whilst the man I was meeting was a stranger to me, we had mutual acquaintances so I knew he wasn't an axe-murderer or morris dancer or anything sinister like that.)