There's many different types of tantra. Most people teach the more new age neo-tantra made popular by Osho. That's more or less like a new age sex techniques type thing...which alot of it is good dont get me wrong. I haven't heard any complaints yet. However, tantra originally was more 80% of an indiviual practice than completely being about sex...of course it was also about sex as well.
I got this book about a month ago at the bookstore called "Tantric Sex" by Kavida Rei that got me really interested in tantra. Later I was at home,sitting outside, drinking a beer reading it in my backyard when my friend walks up. She see's the nude pictures in the book and she's like "What are you reading?" I just said "A book about Tantric Sex." all casually and she got all embarassed and didn't know how to respond. Then another girl texts me and asks what I'm doing and I say the same thing, lol. However, this girl I have been with before and she's like "Ooooh I cant wait to try that out!" My point is go and read it were people can see you reading it. It's a great conversation starter for the modern libertine.