The phrase 'Bollywood' had not even been coined back then. The kingdom of Indian movies only strayed into the shores of other Asian countries. I grew up in Malaysia. Whenever a Rajesh Khanna film was released the whole family would put on our best clothes and wait by the side while my father queued up for tickets. A queue for a Rajesh Khanna film would stretch for ever but everyone waited patiently because he was worth it. Then you went into the cinema and watched a Rajesh Khanna film in colour, Malaysia did not acquire colour TV broadcasting till about 1980, but he was still the best part of the experience.
His movies were very romantic with many tear jerking moments. It was all very hopelessly Indian sentimental tosh but great entertainment. I have posted a video which ranks among the most memorable of Bollywood songs ever. It comes from the film 'Aradhana'. Rajesh Khanna and his co-star are caught in a thunderstorm and have to shelter in a hut. The use of rain, thunder and fire are symbols of lust. In those days kissing and an overt mention of sex was frowned upon on morality grounds but do watch for the crackling and sizzling chemistry.