Can IPC 354 be applied in cases where the victim and perpetrator know each other?
Yes, IPC 354 can be applied in cases where the victim and perpetrator know each other. The section deals with assault or criminal force to a woman with the intent to outrage her modesty, and it does not specify any relationship requirement between the victim and the perpetrator.

The law is designed to protect women from any form of assault or harassment that is intended to outrage their modesty, regardless of whether the perpetrator is a stranger or known to the victim. Therefore, if the elements of the offense defined in IPC 354 are met, such as the use of criminal force or assault with the intent to outrage the modesty of a woman, the law can be applied irrespective of the relationship between the victim and the perpetrator.