The misconception to Tantrik cults in India is that it appears to be an orgy of sorts. The other biased opinion is that sex is wrong or bad. A good question would be "Why"? Its definite that those higher up in the social ladder have had extremely biased opinions and that definitely has trickled down to the masses over time.
The actual truth of it is this. Tantra is a version of the AtharvaVeda. It prescribes various rituals to one of the many activities of man in a day - sex. Whats wrong with that and why consider it bad? Tantrik cults have prevailed across india everywhere. The khajurao and konark temples speak for it so do the temples in the south, though not as explicite.
Why is sex important, or is it the lack of it that makes people commercialize something so sacred into an element of shock or silent delight? Why dilute the potency of the act or ritual? These texts help a human being attain a higher goal through sadhana and rituals which need to be performed with the right thought and respect. It was never simple, and living in a superficial world only dilutes the entire act to a mere performance with results that are satisfactory, leaving one to just imagine what the real thing would be like. Not that i know it, but i believe there is more to it than what meets the eye.
We cannot dismiss something that we fail to understand the first time and stupidity. You need to have patience, for the subtle world is not so easy to understand. No wonder its called "Subtle".
Temples at best can depict concepts at various levels of potency and its up to the aspirant to really try and understand it. What appears as a grose act on the walls of Khajuraho, actually hides something far more potent within its sculptures and people in their limited thoughts just think it stops with sex! These are tantrik diagrams, or yantras which are best understood only be the initiated and are meant only for them. The rest of the superficial guys can quite go fly a kite!
These temples depicted a way of life, whether it is the depiction of a devotee in the act of decapitation or whether its a human sacrifice on full moon night, whether its the worship of the Mother or whether its the fear of Kali, whether its an act of copulation or whether its a sensuous kanya entising a man to enter the temple walls, it has value and that is meant to be respected, not ridiculed. The temples silently tell us through their walls, that there is a world out there beyond our senses and we are quite wasting our time if we do not attempt finding it out.
Living the "real way" was never so simple, so the next time you head to the temple, ask yourself whether it stops with that, or whether you really want to know what the temple has to offer. Clarity come when you open yourself to receive it, till then... you wait.