Pyaar, Ishq or Mohabbat- the essential ingredient of a Bollywood film. And it's something, which most of us look for in a Bollywood outlet, because obviously, for action and sci-fi, we have far better meal offers from Hollywood and Chinese chefs.
Bollywood has always played an important role in defining love and  friendship. Being the superhit of its time, "Kuch Kuch Hota Hai", gave the then teenagers the unique privilege of calling friendship, your love (pyaar dosti hai!). The movie brought the tradition of binding friendship-bands among youngsters and helped (or say ruined) them by converting many college-time friendship into love without their much an effort. Since the band is safer than the one which is tied in RakshaBandhan, so boys happily welcomed this culture and started keeping it in dozens in their pockets feeling its any time urgent requirement. lolz...
Back to "Kuch Kuch Hota Hai('98)", there was no such concept of friendship. As you can see in "Dilwale Dulhaniya Le Jayenge('95)", Kajol (Simran) was afraid of having any such kind of frienship with Shahrukh Khan (Raj). That time, the way of finding out whether the girl loves you or not was also quite different, Shahrukh did a simple test, when it was their last meet on Europe trip and they were not going to see each other after then, wheter she would turn back and see him(in his words, "palat") at the time of departure. Now a days, if you ever do such a test, may be you will end up finding a hundred girls, stepping up in a metro train, turning back again and again (as opposed to Shahrukh's expectation) and in a more massive number, boys would be standing for having a glimpse of as many girls as possible. The self-experience of falling in love has also been changed since then.
In another Bollywood superhit, "Hum Aapke Hain Kaun...!('94)", the hero and heroine, discovered their love for each other in a song, "pehla pehla pyaar hai, pehli pehli baar hai..."; but today, no such thing like "First Love" is existing any more, and Bollywood has also replaced this old phenomenon by a latest song, "Dil sambhal ja zara, "FIR mohabbat karne chala hai tu...". The song is heartily welcomed by this generation, as many have found it exact suiting to their current situations, also "Fir (again)" word doesn't specify which timeth this love is, so no such boundation of calling it first, second, third or so on..., thereby keeping them in safe side. Defining some more new ways of doing, expressing or feeling love, in the most humming song of the decade, "Sheila k jawani...", Katreena (Sheila) even tells that  'Kisi aur ki mujhko zaroorat kya, Main toh khud se pyaar jataun...', that is something more dreadful way of doing love! :P
Well, sometimes Bollywood sets new definitions, styles, fashion, and sometimes it reflects the change in trends of society. Whatever be the reason behind this changing definition of love, it's liked and appreciated by youngsters and without offering much content on a movie, film-makers are able to recover the production cost along with handsome profits. The opposition party will continue to oppose such contents, despite having one copy of  the movie for their inner family theatre...