[kamdev99008]

kavita was never a saddist....... she was an opportunist..........
always used the opportunity in her own favour

1st was in college day....... instead of a serious relation/affair with a boyfriend....... she used used a womeniser as her sex buddy to introduce herself, to the world of sex......... and when she find this progressing to a regular affair.... she not only cut off sexual relations with prem but insulted him also....publicly.

2nd she was never a sex hungy person........
if she was so...... she never broke her relations with prem....... or having relations with others too.
she invited prem.... just to shut the mouths of her parents as well as in-laws....... by impregnation.... but she can do it by medical ways or with anyone.....
but
she also want to dominate manu as punishment to him for his weak performance, not making her pregnant, (frustration) revenge for accusation by manu's family on her for no impregnation
so she invited prem because she was very well known to his(prem's) characteristics ......... well planned to use them in her own favour
she want to breakdown manu mentally....but not physically....... so she actively and passively always encouraged manu's mental humiliation but always defended and cared against physical torture

but ............ prem interjected his own plan by using the opportunity provided by kavita. initially prem's only target was to take revenge from kavita but when kavita started giving him hints to humiliate manu (or may be she given him some detailed instruction about humiliation and achieve submission of manu).....
he started humiliating manu mentally, passively & actively ........... as well as physically to....... as per his (prem's) bullying nature

i have more to explain logically............. but later at your convenience